From f0a4e62bb5343b3b7163bc851cfb4bebfefcc4e7 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Mon, 7 Feb 2022 09:24:11 -0700 Subject: [PATCH] io_uring: Fix use of uninitialized ret in io_eventfd_register() Clang warns: fs/io_uring.c:9396:9: warning: variable 'ret' is uninitialized when used here [-Wuninitialized] return ret; ^~~ fs/io_uring.c:9373:13: note: initialize the variable 'ret' to silence this warning int fd, ret; ^ = 0 1 warning generated. Just return 0 directly and reduce the scope of ret to the if statement, as that is the only place that it is used, which is how the function was before the fixes commit. Fixes: 1a75fac9a0f9 ("io_uring: avoid ring quiesce while registering/unregistering eventfd") Link: https://github.com/ClangBuiltLinux/linux/issues/1579 Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Link: https://lore.kernel.org/r/20220207162410.1013466-1-nathan@kernel.org Signed-off-by: Jens Axboe --- fs/io_uring.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 49bcc5fc688d..1dce3f6e7031 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -9378,7 +9378,7 @@ static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, { struct io_ev_fd *ev_fd; __s32 __user *fds = arg; - int fd, ret; + int fd; ev_fd = rcu_dereference_protected(ctx->io_ev_fd, lockdep_is_held(&ctx->uring_lock)); @@ -9394,14 +9394,14 @@ static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); if (IS_ERR(ev_fd->cq_ev_fd)) { - ret = PTR_ERR(ev_fd->cq_ev_fd); + int ret = PTR_ERR(ev_fd->cq_ev_fd); kfree(ev_fd); return ret; } ev_fd->eventfd_async = eventfd_async; rcu_assign_pointer(ctx->io_ev_fd, ev_fd); - return ret; + return 0; } static void io_eventfd_put(struct rcu_head *rcu)