From dc61e2f4dd6e7c7e61cd17431af69b0af1c9b87b Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Wed, 12 Jun 2019 14:58:43 -0700 Subject: [PATCH 0610/2944] io_uring: fix memory leak of UNIX domain socket inode commit 355e8d26f719c207aa2e00e6f3cfab3acf21769b upstream. Opening and closing an io_uring instance leaks a UNIX domain socket inode. This is because the ->file of the io_uring instance's internal UNIX domain socket is set to point to the io_uring file, but then sock_release() sees the non-NULL ->file and assumes the inode reference is held by the file so doesn't call iput(). That's not the case here, since the reference is still meant to be held by the socket; the actual inode of the io_uring file is different. Fix this leak by NULL-ing out ->file before releasing the socket. Reported-by: syzbot+111cb28d9f583693aefa@syzkaller.appspotmail.com Fixes: 2b188cc1bb85 ("Add io_uring IO interface") Cc: # v5.1+ Signed-off-by: Eric Biggers Signed-off-by: Jens Axboe Signed-off-by: Joseph Qi Reviewed-by: Xiaoguang Wang --- fs/io_uring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index fc2101f..aa92cb4 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2787,8 +2787,10 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx) io_eventfd_unregister(ctx); #if defined(CONFIG_UNIX) - if (ctx->ring_sock) + if (ctx->ring_sock) { + ctx->ring_sock->file = NULL; /* so that iput() is called */ sock_release(ctx->ring_sock); + } #endif io_mem_free(ctx->sq_ring); -- 1.8.3.1