From: Pavel Begunkov <asml.silence@xxxxxxxxx> commit c86d18f4aa93e0e66cda0e55827cd03eea6bc5f8 upstream. When there are no files for __io_sqe_files_scm() to process in the range, it'll free everything and return. However, it forgets to put uid. Fixes: 08a451739a9b5 ("io_uring: allow sparse fixed file sets") Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Link: https://lore.kernel.org/r/accee442376f33ce8aaebb099d04967533efde92.1648226048.git.asml.silence@xxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/io_uring.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7350,6 +7350,7 @@ static int __io_sqe_files_scm(struct io_ fput(fpl->fp[i]); } else { kfree_skb(skb); + free_uid(fpl->user); kfree(fpl); } Patches currently in stable-queue which might be from asml.silence@xxxxxxxxx are queue-5.10/io_uring-fix-memory-leak-of-uid-in-files-registration.patch