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for 4.2 ??? Re: [PATCH V3 2/2] block/nbd: fix memory leak in nbd_open()
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
for 4.2 ??? Re: [PATCH V3 2/2] block/nbd: fix memory leak in nbd_open() |
Date: |
Tue, 3 Dec 2019 17:52:27 +0000 |
It's just a memory leak, but it's a regression in 4.2.
Should we take it into 4.2?
29.11.2019 10:25, address@hidden wrote:
> From: PanNengyuan <address@hidden>
>
> In currently implementation there will be a memory leak when
> nbd_client_connect() returns error status. Here is an easy way to
> reproduce:
>
> 1. run qemu-iotests as follow and check the result with asan:
> ./check -raw 143
>
> Following is the asan output backtrack:
> Direct leak of 40 byte(s) in 1 object(s) allocated from:
> #0 0x7f629688a560 in calloc (/usr/lib64/libasan.so.3+0xc7560)
> #1 0x7f6295e7e015 in g_malloc0 (/usr/lib64/libglib-2.0.so.0+0x50015)
> #2 0x56281dab4642 in qobject_input_start_struct
> /mnt/sdb/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:295
> #3 0x56281dab1a04 in visit_start_struct
> /mnt/sdb/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:49
> #4 0x56281dad1827 in visit_type_SocketAddress
> qapi/qapi-visit-sockets.c:386
> #5 0x56281da8062f in nbd_config
> /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1716
> #6 0x56281da8062f in nbd_process_options
> /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1829
> #7 0x56281da8062f in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873
>
> Direct leak of 15 byte(s) in 1 object(s) allocated from:
> #0 0x7f629688a3a0 in malloc (/usr/lib64/libasan.so.3+0xc73a0)
> #1 0x7f6295e7dfbd in g_malloc (/usr/lib64/libglib-2.0.so.0+0x4ffbd)
> #2 0x7f6295e96ace in g_strdup (/usr/lib64/libglib-2.0.so.0+0x68ace)
> #3 0x56281da804ac in nbd_process_options
> /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1834
> #4 0x56281da804ac in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873
>
> Indirect leak of 24 byte(s) in 1 object(s) allocated from:
> #0 0x7f629688a3a0 in malloc (/usr/lib64/libasan.so.3+0xc73a0)
> #1 0x7f6295e7dfbd in g_malloc (/usr/lib64/libglib-2.0.so.0+0x4ffbd)
> #2 0x7f6295e96ace in g_strdup (/usr/lib64/libglib-2.0.so.0+0x68ace)
> #3 0x56281dab41a3 in qobject_input_type_str_keyval
> /mnt/sdb/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:536
> #4 0x56281dab2ee9 in visit_type_str
> /mnt/sdb/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:297
> #5 0x56281dad0fa1 in visit_type_UnixSocketAddress_members
> qapi/qapi-visit-sockets.c:141
> #6 0x56281dad17b6 in visit_type_SocketAddress_members
> qapi/qapi-visit-sockets.c:366
> #7 0x56281dad186a in visit_type_SocketAddress
> qapi/qapi-visit-sockets.c:393
> #8 0x56281da8062f in nbd_config /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1716
> #9 0x56281da8062f in nbd_process_options
> /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1829
> #10 0x56281da8062f in nbd_open /mnt/sdb/qemu-4.2.0-rc0/block/nbd.c:1873
>
> Reported-by: Euler Robot <address@hidden>
> Signed-off-by: PanNengyuan <address@hidden>
May add:
Fixes: 8f071c9db506e03ab
(I found it just by git log -p, could you please check it by your reproduce?)
Ohh, that's my commit, I'm sorry. If you discovered this commit by yourself,
and added Fixes: tag and myself to CC, I'd have reviewed it a lot earlier..
> ---
> Changes v2 to v1:
> - add a new function to do the common cleanups (suggested by Stefano
> Garzarella).
> ---
> Changes v3 to v2:
> - split in two patches(suggested by Stefano Garzarella)
> ---
> block/nbd.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/block/nbd.c b/block/nbd.c
> index 5805979..09d6925 100644
> --- a/block/nbd.c
> +++ b/block/nbd.c
> @@ -1889,6 +1889,7 @@ static int nbd_open(BlockDriverState *bs, QDict
> *options, int flags,
>
> ret = nbd_client_connect(bs, errp);
> if (ret < 0) {
> + nbd_free_bdrvstate_prop(s);
> return ret;
> }
> /* successfully connected */
>
Thanks for fixing!
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
--
Best regards,
Vladimir
- for 4.2 ??? Re: [PATCH V3 2/2] block/nbd: fix memory leak in nbd_open(),
Vladimir Sementsov-Ogievskiy <=