On Fri, 2020-10-16 at 14:23 +0800, lixiaokeng wrote:
> When multipath -F are executed firstly and multipath -v2 or
> -d are executed later, asan will warn memory leaks. The
> reason is that the mpp allocated in coalesce_paths isn't
> freed. Here we add newmp in configure(multipath) to store
> mpp and free it.
>
> Signed-off-by: Lixiaokeng <lixiaokeng@xxxxxxxxxx>
> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx>
> Signed-off-by: Linfeilong <linfeilong@xxxxxxxxxx>
Besides what Ben noted already, I think you shouldn't force callers to
pass a non-NULL "newmp". The tricky part is to make sure that paths
aren't handled repeatedly in the CMD_DRY_RUN case. Currently pp->mpp !=
NULL is the condition used by coalesce_paths() to check if a path has
already been dealt with; if you simply call remove_map(), that won't
work any more. I suppose you realized that, and that's why you
introduced the non-NULL newmp in multipath (you should have mentioned
that in the changelog message).
I suggest to have callers pass a "vector *pnewmp" instead of "vector
newmp", always allocate newmp in coalesce_paths(), and upon return,
either free newmp, or assign it to the pointer passed by the caller:
if (pnewmp)
*pnewmp = newmp;
else
free_multipathvec(newmp, KEEP_PATHS);
Regards,
Martin
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