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[v2] 9pfs: fix memory leak in v9fs_write

Message ID 57fe3666.018b240a.e96e4.4825@mx.google.com
State New
Headers show

Commit Message

Li Qiang Oct. 12, 2016, 1:10 p.m. UTC 
From: Li Qiang <liqiang6-s@360.cn>

If an error occurs when marshal the transfer length to the guest, the
v9fs_write doesn't free an IO vector, thus leading a memory leak.
This patch fix this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
---
 hw/9pfs/9p.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Greg Kurz Oct. 12, 2016, 2:09 p.m. UTC | #1 
On Wed, 12 Oct 2016 06:10:56 -0700
Li Qiang <liq3ea@gmail.com> wrote:
> From: Li Qiang <liqiang6-s@360.cn>
> 
> If an error occurs when marshal the transfer length to the guest, the
> v9fs_write doesn't free an IO vector, thus leading a memory leak.
> This patch fix this.
> 
> Signed-off-by: Li Qiang <liqiang6-s@360.cn>
> ---

Good catch again!

Reviewed-by: Greg Kurz <groug@kaod.org>

>  hw/9pfs/9p.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
> index 8b50bfb..c8cf8c2 100644
> --- a/hw/9pfs/9p.c
> +++ b/hw/9pfs/9p.c
> @@ -2090,7 +2090,7 @@ static void v9fs_write(void *opaque)
>      offset = 7;
>      err = pdu_marshal(pdu, offset, "d", total);
>      if (err < 0) {
> -        goto out;
> +        goto out_qiov;
>      }
>      err += offset;
>      trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
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Patch

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 8b50bfb..c8cf8c2 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -2090,7 +2090,7 @@  static void v9fs_write(void *opaque)
     offset = 7;
     err = pdu_marshal(pdu, offset, "d", total);
     if (err < 0) {
-        goto out;
+        goto out_qiov;
     }
     err += offset;
     trace_v9fs_write_return(pdu->tag, pdu->id, total, err);