Continue the program when the pointer assignment is successful.
Signed-off-by: Dong Chuanjian <chuanjian@xxxxxxxxxxxx>
diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c
index 72bd64f65198..1163cd48ff33 100644
--- a/drivers/media/v4l2-core/v4l2-h264.c
+++ b/drivers/media/v4l2-core/v4l2-h264.c
@@ -343,18 +343,19 @@ static const char *format_ref_list_b(const struct v4l2_h264_reflist_builder *bui
int n = 0, i;
*out_str = kmalloc(tmp_str_size, GFP_KERNEL);
-
- n += snprintf(*out_str + n, tmp_str_size - n, "|");
-
- for (i = 0; i < builder->num_valid; i++) {
- int frame_num = builder->refs[reflist[i].index].frame_num;
- u32 poc = v4l2_h264_get_poc(builder, reflist + i);
- bool longterm = builder->refs[reflist[i].index].longterm;
-
- n += scnprintf(*out_str + n, tmp_str_size - n, "%i%c%c|",
- longterm ? frame_num : poc,
- longterm ? 'l' : 's',
- ref_type_to_char(reflist[i].fields));
+ if (*out_str != NULL) {
+ n += snprintf(*out_str + n, tmp_str_size - n, "|");
+
+ for (i = 0; i < builder->num_valid; i++) {
+ int frame_num = builder->refs[reflist[i].index].frame_num;
+ u32 poc = v4l2_h264_get_poc(builder, reflist + i);
+ bool longterm = builder->refs[reflist[i].index].longterm;
+
+ n += scnprintf(*out_str + n, tmp_str_size - n, "%i%c%c|",
+ longterm ? frame_num : poc,
+ longterm ? 'l' : 's',
+ ref_type_to_char(reflist[i].fields));
+ }
}
return *out_str;
--
2.18.2
