xfs: catch invalid negative blknos in _xfs_buf_find()

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Here blkno is a daddr_t, which is a __s64; it's possible to hold
a value which is negative, and thus pass the (blkno >= eofs)
test.  Then we try to do a xfs_perag_get() for a ridiculous
agno via xfs_daddr_to_agno(), and bad things happen when that
fails, and returns a null pag which is dereferenced shortly
thereafter.

Found via a user-supplied fuzzed image...

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

...

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Eric Sandeen 2014-11-28 14:03:55 +11:00 • committed by Dave Chinner

parent 91ee575f2b

commit db52d09ecb

1 changed files with 1 additions and 1 deletions

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fs/xfs/xfs_buf.c

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