From: Pavel Begunkov <[email protected]>
To: Colin King <[email protected]>,
Jens Axboe <[email protected]>,
[email protected]
Cc: [email protected], [email protected]
Subject: Re: [PATCH][next] io_uring: Fix memory leak on error return path.
Date: Thu, 29 Apr 2021 11:32:13 +0100 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 4/29/21 11:26 AM, Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> 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 <[email protected]>
> ---
> 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;
> + }
Buggy indeed, should have been:
ret = -EINVAL;
break;
Colin, can you resend with the change?
>
> ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
> &last_hpage);
>
--
Pavel Begunkov
next prev parent reply other threads:[~2021-04-29 10:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-29 10:26 [PATCH][next] io_uring: Fix memory leak on error return path Colin King
2021-04-29 10:32 ` Pavel Begunkov [this message]
2021-04-29 10:36 ` Colin Ian King
2021-04-29 10:41 ` Pavel Begunkov
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