linux-kernel - [PATCH][next] io_uring: Fix memory leak on error return path.

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Message-Id: <20210429102654.58943-1-colin.king@canonical.com>
Date:   Thu, 29 Apr 2021 11:26:54 +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] io_uring: Fix memory leak on error return path.

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

Currently the -EINVAL error return path is leaking memory allocated
to data. Fix this by kfree'ing data before the return.

Addresses-Coverity: ("Resource leak")
Fixes: c3a40789f6ba ("io_uring: allow empty slots for reg buffers")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 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 47c2f126f885..beeb477e4f6a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8417,8 +8417,10 @@ static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
 		ret = io_buffer_validate(&iov);
 		if (ret)
 			break;
-		if (!iov.iov_base && tag)
+		if (!iov.iov_base && tag) {
+			kfree(data);
 			return -EINVAL;
+		}
 
 		ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
 					     &last_hpage);
-- 
2.30.2