fuse: prevent fuse_put_request on invalid pointer

fuse_direct_io() has a loop where requests are allocated in each
iteration. if allocation fails, the loop is broken out and follows
into an unconditional fuse_put_request() on that invalid pointer.

Signed-off-by: Anand V. Avati <avati@gluster.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@kernel.org

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a3492f7d207c..5887a6395ad2 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1063,7 +1063,8 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
                                 break;
                 }
         }
-        fuse_put_request(fc, req);
+        if (!IS_ERR(req))
+                fuse_put_request(fc, req);
         if (res > 0)
                 *ppos = pos;