tools: bpf_jit_disasm: check for klogctl failure
klogctl can fail and return -ve len, so check for this and
return NULL to avoid passing a (size_t)-1 to malloc.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/tools/net/bpf_jit_disasm.c b/tools/net/bpf_jit_disasm.c
index 5b32413..544b05a 100644
--- a/tools/net/bpf_jit_disasm.c
+++ b/tools/net/bpf_jit_disasm.c
@@ -98,6 +98,9 @@
char *buff;
len = klogctl(CMD_ACTION_SIZE_BUFFER, NULL, 0);
+ if (len < 0)
+ return NULL;
+
buff = malloc(len);
if (!buff)
return NULL;
