dm cache: fix NULL pointer when switching from cleaner policy

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[ Upstream commit 2bffa1503c ]

The cleaner policy doesn't make use of the per cache block hint space in
the metadata (unlike the other policies).  When switching from the
cleaner policy to mq or smq a NULL pointer crash (in dm_tm_new_block)
was observed.  The crash was caused by bugs in dm-cache-metadata.c
when trying to skip creation of the hint btree.

The minimal fix is to change hint size for the cleaner policy to 4 bytes
(only hint size supported).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Joe Thornber 2015-10-09 14:03:38 +01:00 • committed by Sasha Levin

parent 5b0d0df8f7

commit d2adffd701

1 changed files with 1 additions and 1 deletions

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drivers/md/dm-cache-policy-cleaner.c

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