x86/ras/mce_amd_inj: Return early on invalid input
authorAravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Mon, 12 Oct 2015 09:22:38 +0000 (11:22 +0200)
committerIngo Molnar <mingo@kernel.org>
Mon, 12 Oct 2015 14:15:47 +0000 (16:15 +0200)
commit85c9306d44f757d2fb3b0e3e399080a025315c7f
treef3739ff23a559c7370e6a578edbde3daad2e3c5a
parentcdbcd239e2e264dc3ef7bc7865bcb8ec0023876f
x86/ras/mce_amd_inj: Return early on invalid input

Invalid inputs such as these are currently reported in dmesg as
failing:

  $> echo sweet > flags
  [  122.079139] flags_write: Invalid flags value: et

even though the 'flags' attribute has been updated correctly:

  $> cat flags
  sw

This is because userspace keeps writing the remaining buffer
until it encounters an error.

However, the input as a whole is wrong and we should not be
writing anything to the file. Therefore, correct flags_write()
to return -EINVAL immediately on bad input strings.

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/1443190851-2172-2-git-send-email-Aravind.Gopalakrishnan@amd.com
Link: http://lkml.kernel.org/r/1444641762-9437-3-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/ras/mce_amd_inj.c