From: Wolfgang Frisch <wolfgang.frisch@xxxxxxxx> When extent tree is corrupted we can hit BUG_ON in ext4_es_cache_extent(). Check for this and abort caching instead of crashing the machine. Signed-off-by: Wolfgang Frisch <wolfgang.frisch@xxxxxxxx> Signed-off-by: Jan Kara <jack@xxxxxxx> --- fs/ext4/extents.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 221f240eae60..e76d00fda104 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -471,6 +471,10 @@ static void ext4_cache_extents(struct inode *inode, ext4_lblk_t lblk = le32_to_cpu(ex->ee_block); int len = ext4_ext_get_actual_len(ex); + /* Corrupted extent tree? Stop caching... */ + if (lblk + len < lblk || lblk + len > EXT4_MAX_LOGICAL_BLOCK) + return; + if (prev && (prev != lblk)) ext4_es_cache_extent(inode, prev, lblk - prev, ~0, EXTENT_STATUS_HOLE); -- 2.16.4
