From eb1960c4812ca8ed4ef0e413f9b68178789c0f7a Mon Sep 17 00:00:00 2001
From: woruyu <1214539920@qq.com>
Date: Tue, 30 Sep 2025 10:45:20 +0800
Subject: [PATCH] [sanitizer] Handle nullptr name in prctl(PR_SET_VMA,
 PR_SET_VMA_ANON_NAME) (#160824)

### Summary
This PR resolves https://github.com/llvm/llvm-project/issues/160562
---
 .../lib/sanitizer_common/sanitizer_common_interceptors.inc     | 2 +-
 compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp    | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index a96d325d0898..b10ce7fa44af 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -1326,7 +1326,7 @@ PRCTL_INTERCEPTOR(int, prctl, int option, unsigned long arg2,
   static const int PR_SET_SECCOMP = 22;
   static const int SECCOMP_MODE_FILTER = 2;
 #  endif
-  if (option == PR_SET_VMA && arg2 == 0UL) {
+  if (option == PR_SET_VMA && arg2 == 0UL && arg5 != 0UL) {
     char *name = (char *)arg5;
     COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
   }
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp b/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
index dab1d1b48f86..afce9dc03dad 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
@@ -88,5 +88,8 @@ int main() {
   res = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &pr);
   assert(res == -1);
 
+  unsigned long name = reinterpret_cast<unsigned long>(nullptr);
+  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, 0, nullptr, name);
+
   return 0;
 }