linux-kernel - [PATCH][next][V2] io_uring: Fix uninitialized variable up.resv

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Date:   Mon, 26 Apr 2021 11:13:53 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        io-uring@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next][V2] io_uring: Fix uninitialized variable up.resv

From: Colin Ian King <colin.king@...onical.com>

The variable up.resv is not initialized and is being checking for a
non-zero value in the call to _io_register_rsrc_update. Fix this by
explicitly setting up.resv to 0.

Addresses-Coverity: ("Uninitialized scalar variable)"
Fixes: c3bdad027183 ("io_uring: add generic rsrc update with tags")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Reviewed-by: Pavel Begunkov <asml.silence@...il.com>
---

V2: replace "pointer" in commit message with "up.resv"

---
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index f4ec092c23f4..63f610ee274b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5842,6 +5842,7 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
 	up.data = req->rsrc_update.arg;
 	up.nr = 0;
 	up.tags = 0;
+	up.resv = 0;
 
 	mutex_lock(&ctx->uring_lock);
 	ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
-- 
2.30.2