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samples, selftests/bpf: add NULL check for ksym_search

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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 <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Daniel T. Lee 2019-04-04 07:17:56 +09:00 • committed by Daniel Borkmann
commit e67b2c7154
5 changed files with 23 additions and 3 deletions
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5
samples/bpf/offwaketime_user.c
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@ -28,6 +28,11 @@ static void print_ksym(__u64 addr)
if (!addr)
return;
sym = ksym_search(addr);
if (!sym) {
printf("ksym not found. Is kallsyms loaded?\n");
return;
}
if (PRINT_RAW_ADDR)
printf("%s/%llx;", sym->name, addr);
else

5
samples/bpf/sampleip_user.c
View file

@ -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 {

7
samples/bpf/spintest_user.c
View file

@ -37,8 +37,13 @@ int main(int ac, char **argv)
bpf_map_lookup_elem(map_fd[0], &next_key, &value);
assert(next_key == value);
sym = ksym_search(value);
printf(" %s", sym->name);
key = next_key;
if (!sym) {
printf("ksym not found. Is kallsyms loaded?\n");
continue;
}
printf(" %s", sym->name);
}
if (key)
printf("\n");

5
samples/bpf/trace_event_user.c
View file

@ -34,6 +34,11 @@ static void print_ksym(__u64 addr)
if (!addr)
return;
sym = ksym_search(addr);
if (!sym) {
printf("ksym not found. Is kallsyms loaded?\n");
return;
}
printf("%s;", sym->name);
if (!strcmp(sym->name, "sys_read"))
sys_read_seen = true;