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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Quentin Casasnovas 2015-03-03 16:31:38 +01:00 committed by Greg Kroah-Hartman
parent fa41700e37
commit edf2ec9971
1 changed files with 1 additions and 1 deletions
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fs/btrfs/tree-log.c
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@ -943,7 +943,7 @@ 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);