ext4: don't read out of bounds when checking for in-inode xattrs

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commit 290ab23001 upstream.

With i_extra_isize equal to or close to the available space, it was
possible for us to read past the end of the inode when trying to detect
or validate in-inode xattrs.  Fix this by checking for the needed extra
space first.

This patch shouldn't have any noticeable effect on
non-corrupted/non-malicious filesystems.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Eric Biggers 2016-12-01 14:51:58 -05:00 • committed by Ben Hutchings

parent af636c8e60

commit 4cd2e66c84

2 changed files with 5 additions and 4 deletions

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4

fs/ext4/inode.c

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5

fs/ext4/xattr.c

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