ext4: add bounds checking to ext4_xattr_find_entry()

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commit 9496005d6c upstream.

Add some paranoia checks to make sure we don't stray beyond the end of
the valid memory region containing ext4 xattr entries while we are
scanning for a match.

Also rename the function to xattr_find_entry() since it is static and
thus only used in fs/ext4/xattr.c

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[bwh: Backported to 3.16:
 - Keep passing an explicit size to xattr_find_entry()
 - s/EFSCORRUPTED/EIO/]]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Theodore Ts'o 2018-03-30 20:00:56 -04:00 • committed by Ben Hutchings

parent 044bfc32eb

commit 9fd4629252

1 changed files with 22 additions and 13 deletions

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fs/ext4/xattr.c

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