[dm-devel] [PATCH 11/14] mpathpersist: check whether malloc paramp->trnptid_list, fails in handle_args func

[lixiaokeng]

In handle_args func, we donot check whether malloc paramp and
each paramp->trnptid_list[j] fails before using them, it may
cause access NULL pointer.

Here, we add alloc_prout_param_descriptor to allocate and init
paramp, and we add free_prout_param_descriptor to free paramp
and each paramp->trnptid_list[j].

Signed-off-by: Zhiqiang Liu <liuzhiqiang26 at huawei.com>
Signed-off-by: lixiaokeng <lixiaokeng at huawei.com>
Signed-off-by: Linfeilong <linfeilong at huawei.com>
---
 mpathpersist/main.c | 55 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/mpathpersist/main.c b/mpathpersist/main.c
index 28bfe410..f20c902c 100644
--- a/mpathpersist/main.c
+++ b/mpathpersist/main.c
@@ -153,6 +153,39 @@ static int do_batch_file(const char *batch_fn)
 	return ret;
 }

+static struct prout_param_descriptor *
+alloc_prout_param_descriptor(int num_transportid)
+{
+	struct prout_param_descriptor *paramp;
+
+	if (num_transportid < 0 || num_transportid > MPATH_MX_TIDS)
+		return NULL;
+
+	paramp= malloc(sizeof(struct prout_param_descriptor) +
+				(sizeof(struct transportid *) * num_transportid));
+
+	if (!paramp)
+		return NULL;
+
+	paramp->num_transportid = num_transportid;
+	memset(paramp, 0, sizeof(struct prout_param_descriptor) +
+			(sizeof(struct transportid *) * num_transportid));
+	return paramp;
+}
+
+static void free_prout_param_descriptor(struct prout_param_descriptor *paramp)
+{
+	int i;
+	if (!paramp)
+		return;
+
+	for (i = 0; i < paramp->num_transportid; i++)
+		free(paramp->trnptid_list[i]);
+
+	free(paramp);
+	paramp = NULL;
+}
+
 static int handle_args(int argc, char * argv[], int nline)
 {
 	int c;
@@ -525,9 +558,12 @@ static int handle_args(int argc, char * argv[], int nline)
 		int j;
 		struct prout_param_descriptor *paramp;

-		paramp= malloc(sizeof(struct prout_param_descriptor) + (sizeof(struct transportid *)*(MPATH_MX_TIDS )));
-
-		memset(paramp, 0, sizeof(struct prout_param_descriptor) + (sizeof(struct transportid *)*(MPATH_MX_TIDS)));
+		paramp = alloc_prout_param_descriptor(num_transport);
+		if (!paramp) {
+			fprintf(stderr, "malloc paramp failed\n");
+			ret = MPATH_PR_OTHER;
+			goto out_fd;
+		}

 		for (j = 7; j >= 0; --j) {
 			paramp->key[j] = (param_rk & 0xff);
@@ -551,6 +587,12 @@ static int handle_args(int argc, char * argv[], int nline)
 			for (j = 0 ; j < num_transport; j++)
 			{
 				paramp->trnptid_list[j] = (struct transportid *)malloc(sizeof(struct transportid));
+				if (!paramp->trnptid_list[j]) {
+					fprintf(stderr, "malloc paramp->trnptid_list[%d] failed.\n", j);
+					ret = MPATH_PR_OTHER;
+					free_prout_param_descriptor(paramp);
+					goto out_fd;
+				}
 				memcpy(paramp->trnptid_list[j], &transportids[j],sizeof(struct transportid));
 			}
 		}
@@ -558,12 +600,7 @@ static int handle_args(int argc, char * argv[], int nline)
 		/* PROUT commands other than 'register and move' */
 		ret = __mpath_persistent_reserve_out (fd, prout_sa, 0, prout_type,
 				paramp, noisy);
-		for (j = 0 ; j < num_transport; j++)
-		{
-			tmp = paramp->trnptid_list[j];
-			free(tmp);
-		}
-		free(paramp);
+		free_prout_param_descriptor(paramp);
 	}

 	if (ret != MPATH_PR_SUCCESS)
--