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authorAl Viro <viro@zeniv.linux.org.uk>2015-01-18 23:37:32 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-01-18 23:49:26 -0500
commit378ff1a53b5724f3ac97b0aba3c9ecac072f6fcd (patch)
treecd81852109bbf82a77ff54de1f00d61408c3d920
parentec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc (diff)
fix deadlock in cifs_ioctl_clone()
It really needs to check that src is non-directory *and* use {un,}lock_two_nodirectories(). As it is, it's trivial to cause double-lock (ioctl(fd, CIFS_IOC_COPYCHUNK_FILE, fd)) and if the last argument is an fd of directory, we are asking for trouble by violating the locking order - all directories go before all non-directories. If the last argument is an fd of parent directory, it has 50% odds of locking child before parent, which will cause AB-BA deadlock if we race with unlink(). Cc: stable@vger.kernel.org @ 3.13+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/cifs/ioctl.c21
1 files changed, 5 insertions, 16 deletions
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 45cb59bcc791..8b7898b7670f 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -86,21 +86,16 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
}
src_inode = file_inode(src_file.file);
+ rc = -EINVAL;
+ if (S_ISDIR(src_inode->i_mode))
+ goto out_fput;
/*
* Note: cifs case is easier than btrfs since server responsible for
* checks for proper open modes and file type and if it wants
* server could even support copy of range where source = target
*/
-
- /* so we do not deadlock racing two ioctls on same files */
- if (target_inode < src_inode) {
- mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
- mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
- } else {
- mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
- mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
- }
+ lock_two_nondirectories(target_inode, src_inode);
/* determine range to clone */
rc = -EINVAL;
@@ -124,13 +119,7 @@ static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
out_unlock:
/* although unlocking in the reverse order from locking is not
strictly necessary here it is a little cleaner to be consistent */
- if (target_inode < src_inode) {
- mutex_unlock(&src_inode->i_mutex);
- mutex_unlock(&target_inode->i_mutex);
- } else {
- mutex_unlock(&target_inode->i_mutex);
- mutex_unlock(&src_inode->i_mutex);
- }
+ unlock_two_nondirectories(src_inode, target_inode);
out_fput:
fdput(src_file);
out_drop_write:

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