kasan: simplify kasan_complete_mode_report_info for tag-based modes

memcpy the alloc/free tracks when collecting the information about a bad
access instead of copying fields one by one.

Link: https://lkml.kernel.org/r/20231221183540.168428-4-andrey.konovalov@linux.dev
Fixes: 5d4c6ac9 ("kasan: record and report more information")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Juntong Deng <juntong.deng@outlook.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/kasan/report_tags.c

@@ -27,15 +27,6 @@ static const char *get_common_bug_type(struct kasan_report_info *info)
 	return "invalid-access";
 }
 
-#ifdef CONFIG_KASAN_EXTRA_INFO
-static void kasan_complete_extra_report_info(struct kasan_track *track,
-					 struct kasan_stack_ring_entry *entry)
-{
-	track->cpu = entry->track.cpu;
-	track->timestamp = entry->track.timestamp;
-}
-#endif /* CONFIG_KASAN_EXTRA_INFO */
-
 void kasan_complete_mode_report_info(struct kasan_report_info *info)
 {
 	unsigned long flags;
@@ -80,11 +71,8 @@ void kasan_complete_mode_report_info(struct kasan_report_info *info)
 			if (free_found)
 				break;
 
-			info->free_track.pid = entry->track.pid;
-			info->free_track.stack = entry->track.stack;
-#ifdef CONFIG_KASAN_EXTRA_INFO
-			kasan_complete_extra_report_info(&info->free_track, entry);
-#endif /* CONFIG_KASAN_EXTRA_INFO */
+			memcpy(&info->free_track, &entry->track,
+			       sizeof(info->free_track));
 			free_found = true;
 
 			/*
@@ -98,11 +86,8 @@ void kasan_complete_mode_report_info(struct kasan_report_info *info)
 			if (alloc_found)
 				break;
 
-			info->alloc_track.pid = entry->track.pid;
-			info->alloc_track.stack = entry->track.stack;
-#ifdef CONFIG_KASAN_EXTRA_INFO
-			kasan_complete_extra_report_info(&info->alloc_track, entry);
-#endif /* CONFIG_KASAN_EXTRA_INFO */
+			memcpy(&info->alloc_track, &entry->track,
+			       sizeof(info->alloc_track));
 			alloc_found = true;
 
 			/*