File common-Ignore-samples-for-exiting-tasks.patch of Package numatop

From 636bf0ee924034d51e63a20325353f2e9384b3de Mon Sep 17 00:00:00 2001
From: Sandipan Das <sandipan.das@amd.com>
Date: Thu, 10 Jul 2025 11:57:03 +0530
Subject: [PATCH] common: Ignore samples for exiting tasks

After the inclusion of Linux commit 1d953111b648 ("perf/core: Don't
report zero PIDs for exiting tasks"), perf samples will report PID as
-1 for exiting tasks.

Such samples lead to segmentation faults during process lookup when
proc_find_nolock() is called with -1 as the PID. Process data at the
the hash table index returned by PROC_HASHTBL_INDEX() is invalid and
any dereference of the corresponding track_proc_t pointer results in
a bad access. Hence, ignore samples for exiting tasks.

Fixes: 972a9d0 ("Reconstruct code for better OS-independent.")
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
---
 common/os/pfwrapper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/os/pfwrapper.c b/common/os/pfwrapper.c
index 10042d9..780458e 100644
--- a/common/os/pfwrapper.c
+++ b/common/os/pfwrapper.c
@@ -497,7 +497,7 @@ ll_sample_read(struct perf_event_mmap_page *mhdr, int size,
 	 *	{ u64   data_src; }
 	 * };
 	 */
-	if (mmap_buffer_read(mhdr, &id, sizeof (id)) == -1) {
+	if (mmap_buffer_read(mhdr, &id, sizeof (id)) == -1 || id.pid == -1U) {
 		debug_print(NULL, 2, "ll_sample_read: read pid/tid failed.\n");
 		goto L_EXIT;
 	}