Junichi Nomura 2e86222c67 x86/microcode/intel: Use correct buffer size for saving microcode data ... In generic_load_microcode(), curr_mc_size is the size of the last allocated buffer and since we have this performance "optimization" there to vmalloc a new buffer only when the current one is bigger, curr_mc_size ends up becoming the size of the biggest buffer we've seen so far. However, we end up saving the microcode patch which matches our CPU and its size is not curr_mc_size but the respective mc_size during the iteration while we're staring at it. So save that mc_size into a separate variable and use it to store the previously found microcode buffer. Without this fix, we could get oops like this: BUG: unable to handle kernel paging request at ffffc9000e30f000 IP: __memcpy+0x12/0x20 ... Call Trace: ? kmemdup+0x43/0x60 __alloc_microcode_buf+0x44/0x70 save_microcode_patch+0xd4/0x150 generic_load_microcode+0x1b8/0x260 request_microcode_user+0x15/0x20 microcode_write+0x91/0x100 __vfs_write+0x34/0x120 vfs_write+0xc1/0x130 SyS_write+0x56/0xc0 do_syscall_64+0x6c/0x160 entry_SYSCALL64_slow_path+0x25/0x25 Fixes: 06b8534cb7 ("x86/microcode: Rework microcode loading") Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/4f33cbfd-44f2-9bed-3b66-7446cd14256f@ce.jp.nec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2017-01-09 23:11:15 +01:00
..
amd.c	x86/microcode/AMD: Use native_cpuid() in load_ucode_amd_bsp()	2016-12-19 10:46:20 +01:00
core.c	x86/microcode/AMD: Reload proper initrd start address	2016-12-21 10:50:04 +01:00
intel.c	x86/microcode/intel: Use correct buffer size for saving microcode data	2017-01-09 23:11:15 +01:00
Makefile	x86/microcode/intel: Remove intel_lib.c	2016-10-25 12:28:59 +02:00