Given bad input to the io_uring_register syscall the io_ring_ctx user_files member is cleaned up in io_sqe_files_register, but a following call to io_uring_release will result in a double-free. Signed-off-by: Dan Robertson <dan@xxxxxxxxxxxxxxx> --- fs/io_uring.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index bbdbd56cf2ac..07d6ef195d05 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2215,6 +2215,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, fput(ctx->user_files[i]); kfree(ctx->user_files); + ctx->user_files = NULL; ctx->nr_user_files = 0; return ret; } -- 2.21.0
