mem: guard rt_smem_setname() against a NULL name

rt_smem_setname() dereferenced name[index] without checking for
NULL first. Some callers legitimately pass an unnamed allocation
through with a NULL name, which crashed instead of just leaving
the trace field blank.

Treat a NULL name the same as an empty string, so the existing
fill-with-spaces loop below handles it without duplicating that
logic.

Fixes #9793

Signed-off-by: yi chen <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mem.c b/src/mem.c
index ce5a87b5fd..1d8c999040 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -103,6 +103,11 @@ struct rt_small_mem
 rt_inline void rt_smem_setname(struct rt_small_mem_item *mem, const char *name)
 {
     int index;
+    if (name == RT_NULL)
+    {
+        name = "";
+    }
+
     for (index = 0; index < sizeof(mem->thread); index ++)
     {
         if (name[index] == '\0') break;