From: Martin Wilck <mwilck@xxxxxxxx>
There were two leaks in check_path_valid(): if path status was
successfully determined before calling store_pathvec(), free_path()
wasn't called. Also, if an error exit occured, neither cleanup
function was called.
This patch fixes both, at the cost of using "static" for the pp and
pathvec variables.
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
multipath/main.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/multipath/main.c b/multipath/main.c
index 1949a1c..043d8fa 100644
--- a/multipath/main.c
+++ b/multipath/main.c
@@ -93,7 +93,7 @@ void rcu_register_thread_memb(void) {}
void rcu_unregister_thread_memb(void) {}
static int
-filter_pathvec (vector pathvec, char * refwwid)
+filter_pathvec (vector pathvec, const char *refwwid)
{
int i;
struct path * pp;
@@ -594,8 +594,9 @@ static int
check_path_valid(const char *name, struct config *conf, bool is_uevent)
{
int fd, r = PATH_IS_ERROR;
- struct path *pp = NULL;
+ struct path *pp;
vector pathvec = NULL;
+ const char *wwid;
pp = alloc_path();
if (!pp)
@@ -664,14 +665,19 @@ check_path_valid(const char *name, struct config *conf, bool is_uevent)
if (store_path(pathvec, pp) != 0) {
free_path(pp);
+ pp = NULL;
goto fail;
+ } else {
+ /* make sure path isn't freed twice */
+ wwid = pp->wwid;
+ pp = NULL;
}
/* For find_multipaths = SMART, if there is more than one path
* matching the refwwid, then the path is valid */
if (path_discovery(pathvec, DI_SYSFS | DI_WWID) < 0)
goto fail;
- filter_pathvec(pathvec, pp->wwid);
+ filter_pathvec(pathvec, wwid);
if (VECTOR_SIZE(pathvec) > 1)
r = PATH_IS_VALID;
else
@@ -679,21 +685,25 @@ check_path_valid(const char *name, struct config *conf, bool is_uevent)
out:
r = print_cmd_valid(r, pathvec, conf);
- free_pathvec(pathvec, FREE_PATHS);
/*
* multipath -u must exit with status 0, otherwise udev won't
* import its output.
*/
if (!is_uevent && r == PATH_IS_NOT_VALID)
- return RTVL_FAIL;
- return RTVL_OK;
+ r = RTVL_FAIL;
+ else
+ r = RTVL_OK;
+ goto cleanup;
fail:
- if (pathvec)
- free_pathvec(pathvec, FREE_PATHS);
- else
+ r = RTVL_FAIL;
+
+cleanup:
+ if (pp != NULL)
free_path(pp);
- return RTVL_FAIL;
+ if (pathvec != NULL)
+ free_pathvec(pathvec, FREE_PATHS);
+ return r;
}
static int
--
2.29.0
--
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