btrfs: don't stop searching after encountering the wrong item

commit 03b71c6ca6286625d8f1ed44aabab9b5bf5dac10 upstream.

The search ioctl skips items that are too large for a result buffer, but
inline items of a certain size occuring before any search result is
found would trigger an overflow and stop the search entirely.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=57641

Signed-off-by: Gabriel de Perthuis <g2p.code+btrfs@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c04f02c..618ae6f 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1571,7 +1571,11 @@ static noinline int copy_to_sk(struct btrfs_root *root,
                item_off = btrfs_item_ptr_offset(leaf, i);
                item_len = btrfs_item_size_nr(leaf, i);
 
-               if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
+               btrfs_item_key_to_cpu(leaf, key, i);
+               if (!key_in_sk(key, sk))
+                       continue;
+
+               if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
                        item_len = 0;
 
                if (sizeof(sh) + item_len + *sk_offset >
@@ -1580,10 +1584,6 @@ static noinline int copy_to_sk(struct btrfs_root *root,
                        goto overflow;
                }
 
-               btrfs_item_key_to_cpu(leaf, key, i);
-               if (!key_in_sk(key, sk))
-                       continue;
-
                sh.objectid = key->objectid;
                sh.offset = key->offset;
                sh.type = key->type;