[PATCH 02/17] Use memberof(T, m) instead of explicit NULL dereference

From: Alejandro Colomar
Date: Fri Nov 19 2021 - 06:37:24 EST

Signed-off-by: Alejandro Colomar <alx.manpages@xxxxxxxxx>
Cc: Ajit Khaparde <ajit.khaparde@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Corey Minyard <cminyard@xxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Jitendra Bhivare <jitendra.bhivare@xxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: John S. Gruber <JohnSGruber@xxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Ketan Mukadam <ketan.mukadam@xxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Miguel Ojeda <ojeda@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>
Cc: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
Cc: Subbu Seetharaman <subbu.seetharaman@xxxxxxxxxxxx>
Cc: <intel-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: <linux-acpi@xxxxxxxxxxxxxxx>
Cc: <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: <linux-btrfs@xxxxxxxxxxxxxxx>
Cc: <linux-scsi@xxxxxxxxxxxxxxx>
Cc: <netdev@xxxxxxxxxxxxxxx>
Cc: <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/bootparam_utils.h | 3 ++-
arch/x86/kernel/signal_compat.c | 5 +++--
drivers/gpu/drm/i915/i915_utils.h | 5 ++---
drivers/gpu/drm/i915/intel_runtime_pm.h | 2 +-
drivers/net/ethernet/emulex/benet/be.h | 7 ++++---
drivers/net/ethernet/i825xx/ether1.c | 7 +++++--
drivers/scsi/be2iscsi/be.h | 7 ++++---
drivers/scsi/be2iscsi/be_cmds.h | 5 ++++-
fs/btrfs/ctree.h | 5 +++--
include/acpi/actypes.h | 4 +++-
include/linux/container_of.h | 6 +++---
include/linux/virtio_config.h | 14 +++++++-------
12 files changed, 41 insertions(+), 29 deletions(-)

diff --git a/arch/x86/include/asm/bootparam_utils.h b/arch/x86/include/asm/bootparam_utils.h
index 981fe923a59f..71b28b5fb088 100644
--- a/arch/x86/include/asm/bootparam_utils.h
+++ b/arch/x86/include/asm/bootparam_utils.h
@@ -3,6 +3,7 @@
#define _ASM_X86_BOOTPARAM_UTILS_H

#include <asm/bootparam.h>
+#include <linux/container_of.h>

/*
* This file is included from multiple environments. Do not
@@ -19,7 +20,7 @@
* private magic, so it is better to leave it unchanged.
*/

-#define sizeof_mbr(type, member) ({ sizeof(((type *)0)->member); })
+#define sizeof_mbr(type, member) ({ sizeof(memberof(type, member)); })

#define BOOT_PARAM_PRESERVE(struct_member) \
{ \
diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index b52407c56000..28420a7df056 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/compat.h>
+#include <linux/container_of.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>

@@ -69,8 +70,8 @@ static inline void signal_compat_build_tests(void)
* structure stays within the padding size (checked
* above).
*/
-#define CHECK_CSI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((compat_siginfo_t *)0)->_sifields.name))
-#define CHECK_SI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((siginfo_t *)0)->_sifields.name))
+#define CHECK_CSI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(memberof(compat_siginfo_t ,_sifields.name)))
+#define CHECK_SI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(memberof(siginfo_t, _sifields.name)))

CHECK_CSI_OFFSET(_kill);
CHECK_CSI_SIZE (_kill, 2*sizeof(int));
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index 7a5925072466..2e3ec28f4f1b 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -25,6 +25,7 @@
#ifndef __I915_UTILS_H
#define __I915_UTILS_H

+#include <linux/container_of.h>
#include <linux/list.h>
#include <linux/overflow.h>
#include <linux/sched.h>
@@ -192,8 +193,6 @@ __check_struct_size(size_t base, size_t arr, size_t count, size_t *size)
#define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT)
#define page_unpack_bits(ptr, bits) ptr_unpack_bits(ptr, bits, PAGE_SHIFT)

-#define struct_member(T, member) (((T *)0)->member)
-
#define ptr_offset(ptr, member) offsetof(typeof(*(ptr)), member)

#define fetch_and_zero(ptr) ({ \
@@ -215,7 +214,7 @@ static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
*/
#define container_of_user(ptr, type, member) ({ \
void __user *__mptr = (void __user *)(ptr); \
- BUILD_BUG_ON_MSG(!__same_type(*(ptr), struct_member(type, member)) && \
+ BUILD_BUG_ON_MSG(!__same_type(*(ptr), memberof(type, member)) && \
!__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type __user *)(__mptr - offsetof(type, member))); })
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.h b/drivers/gpu/drm/i915/intel_runtime_pm.h
index 47a85fab4130..6cb04bef62ad 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.h
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.h
@@ -73,7 +73,7 @@ struct intel_runtime_pm {
};

#define BITS_PER_WAKEREF \
- BITS_PER_TYPE(struct_member(struct intel_runtime_pm, wakeref_count))
+ BITS_PER_TYPE(memberof(struct intel_runtime_pm, wakeref_count))
#define INTEL_RPM_WAKELOCK_SHIFT (BITS_PER_WAKEREF / 2)
#define INTEL_RPM_WAKELOCK_BIAS (1 << INTEL_RPM_WAKELOCK_SHIFT)
#define INTEL_RPM_RAW_WAKEREF_MASK (INTEL_RPM_WAKELOCK_BIAS - 1)
diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 8689d4a51fe5..dc790bae2451 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -14,6 +14,7 @@
#ifndef BE_H
#define BE_H

+#include <linux/container_of.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
@@ -824,7 +825,7 @@ extern const struct ethtool_ops be_ethtool_ops;

/* Returns bit offset within a DWORD of a bitfield */
#define AMAP_BIT_OFFSET(_struct, field) \
- (((size_t)&(((_struct *)0)->field))%32)
+ (((size_t)&(memberof(_struct, field)))%32)

/* Returns the bit mask of the field that is NOT shifted into location. */
static inline u32 amap_mask(u32 bitsize)
@@ -843,7 +844,7 @@ amap_set(void *ptr, u32 dw_offset, u32 mask, u32 offset, u32 value)
#define AMAP_SET_BITS(_struct, field, ptr, val) \
amap_set(ptr, \
offsetof(_struct, field)/32, \
- amap_mask(sizeof(((_struct *)0)->field)), \
+ amap_mask(sizeof(memberof(_struct, field))), \
AMAP_BIT_OFFSET(_struct, field), \
val)

@@ -856,7 +857,7 @@ static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
#define AMAP_GET_BITS(_struct, field, ptr) \
amap_get(ptr, \
offsetof(_struct, field)/32, \
- amap_mask(sizeof(((_struct *)0)->field)), \
+ amap_mask(sizeof(memberof(_struct, field))), \
AMAP_BIT_OFFSET(_struct, field))

#define GET_RX_COMPL_V0_BITS(field, ptr) \
diff --git a/drivers/net/ethernet/i825xx/ether1.c b/drivers/net/ethernet/i825xx/ether1.c
index c612ef526d16..4dece3476d31 100644
--- a/drivers/net/ethernet/i825xx/ether1.c
+++ b/drivers/net/ethernet/i825xx/ether1.c
@@ -28,6 +28,7 @@
* 1.07 RMK 13/05/2000 Updated for 2.3.99-pre8
*/

+#include <linux/containerof.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -80,8 +81,10 @@ static char version[] = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
#define DISABLEIRQS 1
#define NORMALIRQS 0

-#define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
-#define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
+#define ether1_readw(dev, addr, type, offset, svflgs) \
+ ether1_inw_p(dev, addr + (int)(&(memberof(type, offset))), svflgs)
+#define ether1_writew(dev, val, addr, type, offset, svflgs) \
+ ether1_outw_p(dev, val, addr + (int)(&(memberof(type, offset))), svflgs)

static inline unsigned short
ether1_inw_p (struct net_device *dev, int addr, int svflgs)
diff --git a/drivers/scsi/be2iscsi/be.h b/drivers/scsi/be2iscsi/be.h
index 4c58a02590c7..6830e07fd37a 100644
--- a/drivers/scsi/be2iscsi/be.h
+++ b/drivers/scsi/be2iscsi/be.h
@@ -10,6 +10,7 @@
#ifndef BEISCSI_H
#define BEISCSI_H

+#include <linux/container_of.h>
#include <linux/pci.h>
#include <linux/if_vlan.h>
#include <linux/irq_poll.h>
@@ -153,7 +154,7 @@ struct be_ctrl_info {

/* Returns bit offset within a DWORD of a bitfield */
#define AMAP_BIT_OFFSET(_struct, field) \
- (((size_t)&(((_struct *)0)->field))%32)
+ (((size_t)&(memberof(_struct, field)))%32)

/* Returns the bit mask of the field that is NOT shifted into location. */
static inline u32 amap_mask(u32 bitsize)
@@ -172,7 +173,7 @@ static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
#define AMAP_SET_BITS(_struct, field, ptr, val) \
amap_set(ptr, \
offsetof(_struct, field)/32, \
- amap_mask(sizeof(((_struct *)0)->field)), \
+ amap_mask(sizeof(memberof(_struct, field))), \
AMAP_BIT_OFFSET(_struct, field), \
val)

@@ -185,7 +186,7 @@ static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
#define AMAP_GET_BITS(_struct, field, ptr) \
amap_get(ptr, \
offsetof(_struct, field)/32, \
- amap_mask(sizeof(((_struct *)0)->field)), \
+ amap_mask(sizeof(memberof(_struct, field))), \
AMAP_BIT_OFFSET(_struct, field))

#define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
diff --git a/drivers/scsi/be2iscsi/be_cmds.h b/drivers/scsi/be2iscsi/be_cmds.h
index 5f9f0b18ddf3..bb6ee43769d5 100644
--- a/drivers/scsi/be2iscsi/be_cmds.h
+++ b/drivers/scsi/be2iscsi/be_cmds.h
@@ -10,6 +10,9 @@
#ifndef BEISCSI_CMDS_H
#define BEISCSI_CMDS_H

+
+#include <linux/container_of.h>
+
/**
* The driver sends configuration and managements command requests to the
* firmware in the BE. These requests are communicated to the processor
@@ -1300,7 +1303,7 @@ struct be_cmd_get_port_name {

/* Returns the number of items in the field array. */
#define BE_NUMBER_OF_FIELD(_type_, _field_) \
- (sizeof_field(_type_, _field_)/sizeof((((_type_ *)0)->_field_[0])))\
+ (sizeof_field(_type_, _field_) / sizeof(memberof(_type_, _field_[0])))

/**
* Different types of iSCSI completions to host driver for both initiator
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7553e9dc5f93..442b6f937b22 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -6,6 +6,7 @@
#ifndef BTRFS_CTREE_H
#define BTRFS_CTREE_H

+#include <linux/container_of.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/highmem.h>
@@ -1575,13 +1576,13 @@ static inline void put_unaligned_le8(u8 val, void *p)
read_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
- sizeof(((type *)0)->member)))
+ sizeof(memberof(type, member))))

#define write_eb_member(eb, ptr, type, member, result) (\
write_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
- sizeof(((type *)0)->member)))
+ sizeof(memberof(type, member))))

#define DECLARE_BTRFS_SETGET_BITS(bits) \
u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index ff8b3c913f21..c3b0eccb3377 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -10,6 +10,8 @@
#ifndef __ACTYPES_H__
#define __ACTYPES_H__

+#include <linux/container_of.h>
+
/* acpisrc:struct_defs -- for acpisrc conversion */

/*
@@ -508,7 +510,7 @@ typedef u64 acpi_integer;

#define ACPI_TO_POINTER(i) ACPI_CAST_PTR (void, (acpi_size) (i))
#define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) 0)
-#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) 0)
+#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(memberof(d, f)), (void *) 0)
#define ACPI_PHYSADDR_TO_PTR(i) ACPI_TO_POINTER(i)
#define ACPI_PTR_TO_PHYSADDR(i) ACPI_TO_INTEGER(i)

diff --git a/include/linux/container_of.h b/include/linux/container_of.h
index 199c78a3bf29..227418cb8c99 100644
--- a/include/linux/container_of.h
+++ b/include/linux/container_of.h
@@ -8,7 +8,7 @@

#define memberof(T, m) (((T *) NULL)->m)

-#define typeof_member(T, m) typeof(((T*)0)->m)
+#define typeof_member(T, m) typeof(memberof(T, m))

/**
* container_of - cast a member of a structure out to the containing structure
@@ -19,7 +19,7 @@
*/
#define container_of(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
- static_assert(__same_type(*(ptr), ((type *)0)->member) || \
+ static_assert(__same_type(*(ptr), memberof(type, member)) || \
__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })
@@ -34,7 +34,7 @@
*/
#define container_of_safe(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
- static_assert(__same_type(*(ptr), ((type *)0)->member) || \
+ static_assert(__same_type(*(ptr), memberof(type, member)) || \
__same_type(*(ptr), void), \
"pointer type mismatch in container_of_safe()"); \
IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 4d107ad31149..a1e656c0d94a 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -328,12 +328,12 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
)

#define __virtio_native_type(structname, member) \
- typeof(virtio_to_cpu(NULL, ((structname*)0)->member))
+ typeof(virtio_to_cpu(NULL, memberof(structname, member)))

/* Config space accessors. */
#define virtio_cread(vdev, structname, member, ptr) \
do { \
- typeof(((structname*)0)->member) virtio_cread_v; \
+ typeof(memberof(structname, member)) virtio_cread_v; \
\
might_sleep(); \
/* Sanity check: must match the member's type */ \
@@ -362,8 +362,8 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
/* Config space accessors. */
#define virtio_cwrite(vdev, structname, member, ptr) \
do { \
- typeof(((structname*)0)->member) virtio_cwrite_v = \
- cpu_to_virtio(vdev, *(ptr), ((structname*)0)->member); \
+ typeof(memberof(structname, member)) virtio_cwrite_v = \
+ cpu_to_virtio(vdev, *(ptr), memberof(structname, member)); \
\
might_sleep(); \
/* Sanity check: must match the member's type */ \
@@ -397,7 +397,7 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
/* LE (e.g. modern) Config space accessors. */
#define virtio_cread_le(vdev, structname, member, ptr) \
do { \
- typeof(((structname*)0)->member) virtio_cread_v; \
+ typeof(memberof(structname, member)) virtio_cread_v; \
\
might_sleep(); \
/* Sanity check: must match the member's type */ \
@@ -425,8 +425,8 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)

#define virtio_cwrite_le(vdev, structname, member, ptr) \
do { \
- typeof(((structname*)0)->member) virtio_cwrite_v = \
- virtio_cpu_to_le(*(ptr), ((structname*)0)->member); \
+ typeof(memberof(structname, member)) virtio_cwrite_v = \
+ virtio_cpu_to_le(*(ptr), memberof(structname, member)); \
\
might_sleep(); \
/* Sanity check: must match the member's type */ \
--
2.33.1