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authorDaniel T. Lee <danieltimlee@gmail.com>2019-04-04 07:17:56 +0900
committerDaniel Borkmann <daniel@iogearbox.net>2019-04-04 16:43:47 +0200
commite67b2c715415b121339049b630f0b4e1ede888dc (patch)
treeead14552f2199aca864d04cdff0afcd23222eaf9 /samples/bpf/sampleip_user.c
parent0979ff7992fb6f4eb837995b12f4071dcafebd2d (diff)
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samples, selftests/bpf: add NULL check for ksym_search
Since, ksym_search added with verification logic for symbols existence, it could return NULL when the kernel symbols are not loaded. This commit will add NULL check logic after ksym_search. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples/bpf/sampleip_user.c')
-rw-r--r--samples/bpf/sampleip_user.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/samples/bpf/sampleip_user.c b/samples/bpf/sampleip_user.c
index 216c7ecbbbe9..23b90a45c802 100644
--- a/samples/bpf/sampleip_user.c
+++ b/samples/bpf/sampleip_user.c
@@ -109,6 +109,11 @@ static void print_ip_map(int fd)
for (i = 0; i < max; i++) {
if (counts[i].ip > PAGE_OFFSET) {
sym = ksym_search(counts[i].ip);
+ if (!sym) {
+ printf("ksym not found. Is kallsyms loaded?\n");
+ continue;
+ }
+
printf("0x%-17llx %-32s %u\n", counts[i].ip, sym->name,
counts[i].count);
} else {