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firmware_class: make sure fw requests contain a name 

An empty firmware request name will trigger warnings when building
device names. Make sure this is caught earlier and rejected.

The warning was visible via the test_firmware.ko module interface:

echo -ne "\x00" > /sys/devices/virtual/misc/test_firmware/trigger_request

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2014-09-18 11:25:37 -07:00 committed by Greg Kroah-Hartman
parent 41575335ed
commit 471b095dfe
1 changed files with 3 additions and 0 deletions
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3
drivers/base/firmware_class.c
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@ -1105,6 +1105,9 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
if (!firmware_p)
return -EINVAL;
if (!name || name[0] == '\0')
return -EINVAL;
ret = _request_firmware_prepare(&fw, name, device);
if (ret <= 0) /* error or already assigned */
goto out;