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udf: Verify symlink size before loading it
authorJan Kara <jack@suse.cz>
Fri, 19 Dec 2014 11:21:47 +0000 (12:21 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 8 Jan 2015 18:00:50 +0000 (10:00 -0800)
commit5c90d036281629fc55ea46d063d4a7c3c10b02d6
tree28889849b1bf4ff6cc0484fa9ad0eb4c5a487074tree | snapshot
parent1a1f1f00e633d04aea35f391fbd226d99120655bcommit | diff
udf: Verify symlink size before loading it

commit a1d47b262952a45aae62bd49cfaf33dd76c11a2c upstream.

UDF specification allows arbitrarily large symlinks. However we support
only symlinks at most one block large. Check the length of the symlink
so that we don't access memory beyond end of the symlink block.

Reported-by: Carl Henrik Lunde <chlunde@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/udf/symlink.c diff | blob | blame | history
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