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Re: [libvirt] [PATCH 2/6] qemu: Plug memory leak on qemuProcessWaitForMonitor() error path

On 11/30/2011 02:41 PM, Wen Congyang wrote:
At 11/30/2011 02:32 PM, Alex Jia Write:
On 11/30/2011 02:20 PM, Wen Congyang wrote:
At 11/30/2011 01:57 PM, ajia redhat com Write:
From: Alex Jia<ajia redhat com>

Detected by Coverity. Leak introduced in commit 109efd7.

Signed-off-by: Alex Jia<ajia redhat com>
   src/qemu/qemu_process.c |    1 +
   1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 2563f97..f3f44ca 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -1224,6 +1224,7 @@ qemuProcessWaitForMonitor(struct qemud_driver*

           if (VIR_ALLOC_N(buf, buf_size)<   0) {
+            VIR_FORCE_CLOSE(logfd);
               return -1;
I think it is better to goto closelog
Yeah, I think so before, but 'closelog' label will free 'buf', in fact,
we haven't successfully allocate
buf is inited to NULL, so it is safe to use VIR_FREE(buf)
Agree, will send v2 patch based on your advice.
memory to 'buf' variable, I'm not sure whether it is a issue. maybe, the
above is a simple way, otherwise, it should be better if we add a check
for 'buf' variable in 'closelog' label, it looks like this:
if (buf)
If buf is NULL, VIR_FREE(bus) does nothing and is safe.
If you add a check for 'buf', make syntax-check will fail.
Wen Congyang


Chongyang, please correct me if I'm wrong :)

Wen Congyang


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