libbpf-tools/memleak: mmap allocation failed, not added to pointer map (iovisor#5138)

If mmap allocation failed, the address will not be added to pointer map.

Signed-off-by: Xiaobo Liu <[email protected]>

Author: cppcoffee

libbpf-tools/memleak.bpf.c

@@ -119,7 +119,7 @@ static int gen_alloc_exit2(void *ctx, u64 address)
 	info.size = *size;
 	bpf_map_delete_elem(&sizes, &tid);
 
-	if (address != 0) {
+	if (address != 0 && address != MAP_FAILED) {
 		info.timestamp_ns = bpf_ktime_get_ns();
 
 		info.stack_id = bpf_get_stackid(ctx, &stack_traces, stack_flags);

libbpf-tools/memleak.h

@@ -4,6 +4,7 @@
 
 #define ALLOCS_MAX_ENTRIES 1000000
 #define COMBINED_ALLOCS_MAX_ENTRIES 10240
+#define MAP_FAILED -1
 
 struct alloc_info {
 	__u64 size;