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authorJeff Mahoney <jeffm@suse.com>2014-04-02 14:40:26 -0400
committerJan Kara <jack@suse.cz>2014-04-03 00:06:14 +0200
commit01d8885785a60ae8f4c37b0ed75bdc96d0fc6a44 (patch)
tree212ac3940dc154fc2cffe0917c18e15e6e685ee3 /fs/reiserfs/dir.c
parent3e0d8a01043ded18711fe4a0a320e4491f580ce1 (diff)
reiserfs: fix race in readdir
jdm-20004 reiserfs_delete_xattrs: Couldn't delete all xattrs (-2) The -ENOENT is due to readdir calling dir_emit on the same entry twice. If the dir_emit callback sleeps and the tree is changed underneath us, we won't be able to trust deh_offset(deh) anymore. We need to save next_pos before we might sleep so we can find the next entry. CC: stable@vger.kernel.org Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/reiserfs/dir.c')
-rw-r--r--fs/reiserfs/dir.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index 1fd2051109a3..af677353a3f5 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -125,6 +125,7 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx)
int d_reclen;
char *d_name;
ino_t d_ino;
+ loff_t cur_pos = deh_offset(deh);
if (!de_visible(deh))
/* it is hidden entry */
@@ -196,8 +197,9 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx)
if (local_buf != small_buf) {
kfree(local_buf);
}
- // next entry should be looked for with such offset
- next_pos = deh_offset(deh) + 1;
+
+ /* deh_offset(deh) may be invalid now. */
+ next_pos = cur_pos + 1;
if (item_moved(&tmp_ih, &path_to_entry)) {
set_cpu_key_k_offset(&pos_key,