[PATCH v4 5.4 2/2] test_firmware: return -ENOMEM instead of -ENOSPC on failed memory allocation

From: Mirsad Todorovac
Date: Fri Aug 04 2023 - 13:09:48 EST


[ Upstream commit 7dae593cd226a0bca61201cf85ceb9335cf63682 ]

In a couple of situations like

name = kstrndup(buf, count, GFP_KERNEL);
if (!name)
return -ENOSPC;

the error is not actually "No space left on device", but "Out of memory".

It is semantically correct to return -ENOMEM in all failed kstrndup()
and kzalloc() cases in this driver, as it is not a problem with disk
space, but with kernel memory allocator failing allocation.

The semantically correct should be:

name = kstrndup(buf, count, GFP_KERNEL);
if (!name)
return -ENOMEM;

Cc: Dan Carpenter <error27@xxxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
Cc: Brian Norris <computersforpeace@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 5.4
Fixes: c92316bf8e948 ("test_firmware: add batched firmware tests")
Fixes: 0a8adf584759c ("test: add firmware_class loader test")
Fixes: eb910947c82f9 ("test: firmware_class: add asynchronous request trigger")
Fixes: 061132d2b9c95 ("test_firmware: add test custom fallback trigger")
Fixes: 7feebfa487b92 ("test_firmware: add support for request_firmware_into_buf")
Link: https://lore.kernel.org/all/20230606070808.9300-1-mirsad.todorovac@xxxxxxxxxxxx/
Signed-off-by: Mirsad Todorovac <mirsad.todorovac@xxxxxxxxxxxx>

[ This is the backport of the patch to specific to the 5.4 branch. There are no ]
[ semantic differences in the commit when compared to upstream, only fewer instances ]
[ of error code replacement. Backport is provided for completeness sake ]
[ so it would apply to all of the supported LTS kernels. ]

---
v4:
minor clarification in versioning for the patchwork. no change to the commit.

v3:
fixed a minor typo. no change to commit.

v2:
tested on 5.4 stable build.

lib/test_firmware.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index 92d7195d5b5b..dd3850ec1dfa 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -173,7 +173,7 @@ static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp)
{
*dst = kstrndup(name, count, gfp);
if (!*dst)
- return -ENOSPC;
+ return -ENOMEM;
return count;
}

@@ -509,7 +509,7 @@ static ssize_t trigger_request_store(struct device *dev,

name = kstrndup(buf, count, GFP_KERNEL);
if (!name)
- return -ENOSPC;
+ return -ENOMEM;

pr_info("loading '%s'\n", name);

@@ -552,7 +552,7 @@ static ssize_t trigger_async_request_store(struct device *dev,

name = kstrndup(buf, count, GFP_KERNEL);
if (!name)
- return -ENOSPC;
+ return -ENOMEM;

pr_info("loading '%s'\n", name);

@@ -597,7 +597,7 @@ static ssize_t trigger_custom_fallback_store(struct device *dev,

name = kstrndup(buf, count, GFP_KERNEL);
if (!name)
- return -ENOSPC;
+ return -ENOMEM;

pr_info("loading '%s' using custom fallback mechanism\n", name);

@@ -648,7 +648,7 @@ static int test_fw_run_batch_request(void *data)

test_buf = kzalloc(TEST_FIRMWARE_BUF_SIZE, GFP_KERNEL);
if (!test_buf)
- return -ENOSPC;
+ return -ENOMEM;

req->rc = request_firmware_into_buf(&req->fw,
req->name,
--
2.34.1