x86/microcode/intel: Improve microcode patches saving flow
commitaa78c1ccfab6018289bc2bfd0092d516d0a49ec5
authorBorislav Petkov <bp@suse.de>
Fri, 25 Aug 2017 10:04:56 +0000 (25 12:04 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Tue, 29 Aug 2017 08:59:28 +0000 (29 10:59 +0200)
treee5a03ca7cf4701486be7c2c79c390095849f1537
parent0e3258753f8183c63bf68bd274d2cc7e71e5f402
x86/microcode/intel: Improve microcode patches saving flow

Avoid potentially dereferencing a NULL pointer when saving a microcode
patch for early loading on the application processors.

While at it, drop the IS_ERR() checking in favor of simpler, NULL-ptr
checks which are sufficient and rename __alloc_microcode_buf() to
memdup_patch() to more precisely denote what it does.

No functionality change.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/20170825100456.n236w3jebteokfd6@pd.tnic
arch/x86/kernel/cpu/microcode/intel.c