[PATCH] tpm: use get_unaligned_be32 unaligned buffer access.
From: Tomas Winkler
Date: Wed Nov 23 2016 - 05:13:00 EST
Use get_unaligned_be32 as b32_to_cpu doesn't work correctly on
all platforms for unaligned access.
The fix doesn't cover all the cases as also some cast
structures have members on unaligned addresses.
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
drivers/char/tpm/tpm-interface.c | 4 ++--
drivers/char/tpm/tpm-sysfs.c | 2 +-
drivers/char/tpm/tpm.h | 1 +
drivers/char/tpm/tpm_crb.c | 4 ++--
drivers/char/tpm/tpm_i2c_infineon.c | 5 +++--
drivers/char/tpm/tpm_i2c_nuvoton.c | 7 ++++---
drivers/char/tpm/tpm_nsc.c | 4 +---
drivers/char/tpm/tpm_tis_core.c | 4 ++--
8 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 769d8b0d31a3..4cf38d00d1b3 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -353,8 +353,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
if (bufsiz > TPM_BUFSIZE)
bufsiz = TPM_BUFSIZE;
- count = be32_to_cpu(*((__be32 *) (buf + 2)));
- ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+ count = get_unaligned_be32(buf + 2);
+ ordinal = get_unaligned_be32(buf + 6);
if (count == 0)
return -ENODATA;
if (count > bufsiz) {
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 848ad6580b46..2435d710b6af 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -71,7 +71,7 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
data[12], data[13], data[14], data[15],
data[16], data[17], data[18], data[19],
data[20], data[21], data[22], data[23],
- be32_to_cpu(*((__be32 *) (data + 24))));
+ be32_to_cpup((__be32 *)(data + 24)));
for (i = 0; i < 256; i++) {
str += sprintf(str, "%02X ", data[i + 28]);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 1ae976894257..83dba0ff5ea0 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -23,6 +23,7 @@
#ifndef __TPM_H__
#define __TPM_H__
+#include <asm/unaligned.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/fs.h>
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 65040d74bb02..8067cfbfdbe2 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -168,7 +168,7 @@ static u8 crb_status(struct tpm_chip *chip)
static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
- unsigned int expected;
+ u32 expected;
/* sanity check */
if (count < 6)
@@ -178,7 +178,7 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
return -EIO;
memcpy_fromio(buf, priv->rsp, 6);
- expected = be32_to_cpup((__be32 *) &buf[2]);
+ expected = get_unaligned_be32(buf + 2);
if (expected > count)
return -EIO;
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
index 62ee44e57ddc..2dd4e3bb14c7 100644
--- a/drivers/char/tpm/tpm_i2c_infineon.c
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -437,7 +437,8 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0;
- int expected, status;
+ u32 expected;
+ int status;
if (count < TPM_HEADER_SIZE) {
size = -EIO;
@@ -451,7 +452,7 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
goto out;
}
- expected = be32_to_cpu(*(__be32 *)(buf + 2));
+ expected = get_unaligned_be32(buf + 2);
if ((size_t) expected > count) {
size = -EIO;
goto out;
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index e3a9155ee671..7ba9c435da4e 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -273,7 +273,8 @@ static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
struct device *dev = chip->dev.parent;
struct i2c_client *client = to_i2c_client(dev);
s32 rc;
- int expected, status, burst_count, retries, size = 0;
+ int status, burst_count, retries, size = 0;
+ u32 expected;
if (count < TPM_HEADER_SIZE) {
i2c_nuvoton_ready(chip); /* return to idle */
@@ -314,7 +315,7 @@ static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
* convert number of expected bytes field from big endian 32 bit
* to machine native
*/
- expected = be32_to_cpu(*(__be32 *) (buf + 2));
+ expected = get_unaligned_be32(buf + 2);
if (expected > count) {
dev_err(dev, "%s() expected > count\n", __func__);
size = -EIO;
@@ -442,7 +443,7 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
i2c_nuvoton_ready(chip);
return rc;
}
- ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+ ordinal = get_unaligned_be32(buf + 6);
rc = i2c_nuvoton_wait_for_data_avail(chip,
tpm_calc_ordinal_duration(chip,
ordinal),
diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
index 9ff0e072c476..99a8ff6ea37d 100644
--- a/drivers/char/tpm/tpm_nsc.c
+++ b/drivers/char/tpm/tpm_nsc.c
@@ -131,7 +131,6 @@ static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
u8 *buffer = buf;
u8 data, *p;
u32 size;
- __be32 *native_size;
if (count < 6)
return -EIO;
@@ -174,8 +173,7 @@ static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
return -EIO;
}
- native_size = (__force __be32 *) (buf + 2);
- size = be32_to_cpu(*native_size);
+ size = get_unaligned_be32(buf + 2);
if (count < size)
return -EIO;
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 7993678954a2..5323c54dc917 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -222,7 +222,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
goto out;
}
- expected = be32_to_cpu(*(__be32 *) (buf + 2));
+ expected = get_unaligned_be32(buf + 2);
if (expected > count) {
size = -EIO;
goto out;
@@ -371,7 +371,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
goto out_err;
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
- ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+ ordinal = get_unaligned_be32(buf + 6);
if (chip->flags & TPM_CHIP_FLAG_TPM2)
dur = tpm2_calc_ordinal_duration(chip, ordinal);
--
2.7.4