From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
The request_firmware*() APIs uses __getname() to iterate
over the list of paths possible for firmware to be found,
the code however never checked for failure on __getname().
Although *very unlikely*, this can still happen. Add the
missing check.
There is still no checks on the concatenation of the path
and filename passed, that requires a bit more work and
subsequent patches address this. The commit that introduced
this is abb139e7 ("firmware: teach the kernel to load
firmware files directly from the filesystem").
mcgrof@ergon ~/linux (git::firmware-fixes) $ git describe --contains abb139e7
v3.7-rc1~120
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxx>
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
---
drivers/base/firmware_class.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 171841a..49139a1 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -322,7 +322,11 @@ static int fw_get_filesystem_firmware(struct device *device,
{
int i;
int rc = -ENOENT;
- char *path = __getname();
+ char *path;
+
+ path = __getname();
+ if (!path)
+ return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
struct file *file;
--
2.3.2.209.gd67f9d5.dirty
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