x86/microcode/AMD: Check the equivalence table size when scanning it

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Currently, the code scanning the CPU equivalence table read from a
microcode container file assumes that it actually contains a terminating
zero entry.

Check also the size of this table to make sure that no reads past its
end happen, in case there's no terminating zero entry at the end of the
table.

 [ bp: Adjust to new changes. ]

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20181107170218.7596-16-bp@alien8.de

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Maciej S. Szmigiero 2018-09-13 12:01:52 +02:00 • committed by Borislav Petkov

parent 39cd7c17f9

commit 413c89154c

1 changed files with 15 additions and 6 deletions

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arch/x86/kernel/cpu/microcode/amd.c

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