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Subject[PATCH v3 4.19 2/2] test_firmware: return -ENOMEM instead of -ENOSPC on failed memory allocation
Date
[ 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@gmail.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: stable@vger.kernel.org # 4.19, 4.14
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")
Link: https://lore.kernel.org/all/20230606070808.9300-1-mirsad.todorovac@alu.unizg.hr/
Signed-off-by: Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>

[ This is the backport of the patch to 4.19 and 4.14 branches. There are no ]
[ semantic differences in the commit. The same fix applies to 4.19 and 4.14 ]
[ tree. The backport is provided for completenes sake so the bug would be fixed ]
[ for all of the supported LTS kernels ]

---
v2 -> v3:
minor clarifications with the versioning for the patchwork. no change to commit.

v1 -> v2:
removed the Reviewed-by: and Acked-by tags, as this is a slightly different patch and
those need to be reacquired

lib/test_firmware.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index e4688821eab8..b5e779bcfb34 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -160,7 +160,7 @@ 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;
}

@@ -456,7 +456,7 @@ 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);

@@ -497,7 +497,7 @@ 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);

@@ -540,7 +540,7 @@ 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);

--
2.34.1
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