powerpc/pseries: Avoid using the size greater than RTAS_ERROR_LOG_MAX.

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commit 74e96bf44f upstream.

The global mce data buffer that used to copy rtas error log is of 2048
(RTAS_ERROR_LOG_MAX) bytes in size. Before the copy we read
extended_log_length from rtas error log header, then use max of
extended_log_length and RTAS_ERROR_LOG_MAX as a size of data to be copied.
Ideally the platform (phyp) will never send extended error log with
size > 2048. But if that happens, then we have a risk of buffer overrun
and corruption. Fix this by using min_t instead.

Fixes: d368514c30 ("powerpc: Fix corruption when grabbing FWNMI data")
Reported-by: Michal Suchanek <msuchanek@suse.com>
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Mahesh Salgaonkar 2018-07-04 23:27:02 +05:30 • committed by Ben Hutchings

parent 2900232151

commit 20a334b403

1 changed files with 1 additions and 1 deletions

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arch/powerpc/platforms/pseries/ras.c

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