ceph: fix buffer free while holding i_ceph_lock in __ceph_setxattr()

Calling ceph_buffer_put() in __ceph_setxattr() may end up freeing the
i_xattrs.prealloc_blob buffer while holding the i_ceph_lock.  This can be
fixed by postponing the call until later, when the lock is released.

The following backtrace was triggered by fstests generic/117.

  BUG: sleeping function called from invalid context at mm/vmalloc.c:2283
  in_atomic(): 1, irqs_disabled(): 0, pid: 650, name: fsstress
  3 locks held by fsstress/650:
   #0: 00000000870a0fe8 (sb_writers#8){.+.+}, at: mnt_want_write+0x20/0x50
   #1: 00000000ba0c4c74 (&type->i_mutex_dir_key#6){++++}, at: vfs_setxattr+0x55/0xa0
   #2: 000000008dfbb3f2 (&(&ci->i_ceph_lock)->rlock){+.+.}, at: __ceph_setxattr+0x297/0x810
  CPU: 1 PID: 650 Comm: fsstress Not tainted 5.2.0+ #437
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x67/0x90
   ___might_sleep.cold+0x9f/0xb1
   vfree+0x4b/0x60
   ceph_buffer_release+0x1b/0x60
   __ceph_setxattr+0x2b4/0x810
   __vfs_setxattr+0x66/0x80
   __vfs_setxattr_noperm+0x59/0xf0
   vfs_setxattr+0x81/0xa0
   setxattr+0x115/0x230
   ? filename_lookup+0xc9/0x140
   ? rcu_read_lock_sched_held+0x74/0x80
   ? rcu_sync_lockdep_assert+0x2e/0x60
   ? __sb_start_write+0x142/0x1a0
   ? mnt_want_write+0x20/0x50
   path_setxattr+0xba/0xd0
   __x64_sys_lsetxattr+0x24/0x30
   do_syscall_64+0x50/0x1c0
   entry_SYSCALL_64_after_hwframe+0x49/0xbe
  RIP: 0033:0x7ff23514359a

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 37b458a9af3adafafa1b9fc310762762b3ff0841..c083557b36576b057a60447289cef43609ca3a09 100644 (file)
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1036,6 +1036,7 @@ int __ceph_setxattr(struct inode *inode, const char *name,
        struct ceph_inode_info *ci = ceph_inode(inode);
        struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
        struct ceph_cap_flush *prealloc_cf = NULL;
+       struct ceph_buffer *old_blob = NULL;
        int issued;
        int err;
        int dirty = 0;
@@ -1109,13 +1110,15 @@ retry:
                struct ceph_buffer *blob;
 
                spin_unlock(&ci->i_ceph_lock);
-               dout(" preaallocating new blob size=%d\n", required_blob_size);
+               ceph_buffer_put(old_blob); /* Shouldn't be required */
+               dout(" pre-allocating new blob size=%d\n", required_blob_size);
                blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
                if (!blob)
                        goto do_sync_unlocked;
                spin_lock(&ci->i_ceph_lock);
+               /* prealloc_blob can't be released while holding i_ceph_lock */
                if (ci->i_xattrs.prealloc_blob)
-                       ceph_buffer_put(ci->i_xattrs.prealloc_blob);
+                       old_blob = ci->i_xattrs.prealloc_blob;
                ci->i_xattrs.prealloc_blob = blob;
                goto retry;
        }
@@ -1131,6 +1134,7 @@ retry:
        }
 
        spin_unlock(&ci->i_ceph_lock);
+       ceph_buffer_put(old_blob);
        if (lock_snap_rwsem)
                up_read(&mdsc->snap_rwsem);
        if (dirty)