Commit dd9ef135 authored Mar 03, 2015 by Quentin Casasnovas Committed by Chris Mason Mar 05, 2015

Btrfs:__add_inode_ref: out of bounds memory read when looking for extended ref.



Improper arithmetics when calculting the address of the extended ref could
lead to an out of bounds memory read and kernel panic.

Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
cc: stable@vger.kernel.org # v3.7+
Signed-off-by: Chris Mason <clm@fb.com>

parent 3a8b36f3

fs/btrfs/tree-log.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1012,7 +1012,7 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
		base = btrfs_item_ptr_offset(leaf, path->slots[0]);

		while (cur_offset < item_size) {
		extref = (struct btrfs_inode_extref *)base + cur_offset;
		extref = (struct btrfs_inode_extref *)(base + cur_offset);

		victim_name_len = btrfs_inode_extref_name_len(leaf, extref);