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05 April 2024, 19:05:47 UTC
Revision 6343a2120862f7023006c8091ad95c1f16a32077 authored by Miklos Szeredi on 01 July 2016, 12:56:07 UTC, committed by J. Bruce Fields on 01 July 2016, 14:24:18 UTC 
locks: use file_inode()
 
(Another one for the f_path debacle.)

ltp fcntl33 testcase caused an Oops in selinux_file_send_sigiotask.

The reason is that generic_add_lease() used filp->f_path.dentry->inode
while all the others use file_inode().  This makes a difference for files
opened on overlayfs since the former will point to the overlay inode the
latter to the underlying inode.

So generic_add_lease() added the lease to the overlay inode and
generic_delete_lease() removed it from the underlying inode.  When the file
was released the lease remained on the overlay inode's lock list, resulting
in use after free.

Reported-by: Eryu Guan <eguan@redhat.com>
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Cc: <stable@vger.kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1 parent cb7d224
History
Tip revision: 6343a2120862f7023006c8091ad95c1f16a32077 authored by Miklos Szeredi on 01 July 2016, 12:56:07 UTC
locks: use file_inode()
Tip revision: 6343a21
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