From d7ed9643ba5de56b16e4df8627395c633919c3d0 Mon Sep 17 00:00:00 2001 From: stratakis Date: Wed, 28 Jan 2026 14:30:17 +0100 Subject: [PATCH] gh-144194: Fix mmap failure check in perf_jit_trampoline.c (#143713) mmap() returns MAP_FAILED ((void*)-1) on error, not NULL. The current check never detects mmap failures, so jitdump initialization proceeds even when the memory mapping fails. (cherry picked from commit 8fe8a94a7c050bc16cac9ec300f89c0f389f9a44) --- .../2026-01-23-20-20-42.gh-issue-144194.IbXfxd.rst | 1 + Python/perf_jit_trampoline.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) create mode 100644 Misc/NEWS.d/next/Core and Builtins/2026-01-23-20-20-42.gh-issue-144194.IbXfxd.rst diff --git a/Misc/NEWS.d/next/Core and Builtins/2026-01-23-20-20-42.gh-issue-144194.IbXfxd.rst b/Misc/NEWS.d/next/Core and Builtins/2026-01-23-20-20-42.gh-issue-144194.IbXfxd.rst new file mode 100644 index 00000000000000..1f33284439c041 --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2026-01-23-20-20-42.gh-issue-144194.IbXfxd.rst @@ -0,0 +1 @@ +Fix error handling in perf jitdump initialization on memory allocation failure. diff --git a/Python/perf_jit_trampoline.c b/Python/perf_jit_trampoline.c index 3a63dd73bc47cc..b03da66e92e825 100644 --- a/Python/perf_jit_trampoline.c +++ b/Python/perf_jit_trampoline.c @@ -1053,7 +1053,8 @@ static void* perf_map_jit_init(void) { 0 // Offset 0 (first page) ); - if (perf_jit_map_state.mapped_buffer == NULL) { + if (perf_jit_map_state.mapped_buffer == MAP_FAILED) { + perf_jit_map_state.mapped_buffer = NULL; close(fd); return NULL; // Memory mapping failed }