lkml.org 
[lkml]   [2021]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH][next] io_uring: Fix memory leak on error return path.
From
Date
On 4/29/21 11:36 AM, Colin Ian King wrote:
> On 29/04/2021 11:32, Pavel Begunkov wrote:
>> On 4/29/21 11:26 AM, Colin King wrote:
>>> From: Colin Ian King <colin.king@canonical.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@canonical.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;
>>> + }
>>
>> Buggy indeed, should have been:
>>
>> ret = -EINVAL;
>> break;
> Ah, thanks.
>
>>
>> Colin, can you resend with the change?
>
> Will do in a moment or so.

Hmm, there are actually two of them, look for

"iov.iov_base && tag"

>>
>>>
>>> ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
>>> &last_hpage);
>>>
>>
>

--
Pavel Begunkov

\
 
 \ /
  Last update: 2021-04-29 12:42    [W:0.049 / U:1.392 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site