Commit 218c8863 authored Mar 03, 2015 by Quentin Casasnovas Committed by Sasha Levin Mar 14, 2015

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



commit dd9ef135e3542ffc621c4eb7f0091870ec7a1504 upstream.

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>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent 0ab92529

fs/btrfs/tree-log.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1010,7 +1010,7 @@ again:
		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);