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tools: bpf_jit_disasm: check for klogctl failure

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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 <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Colin Ian King 2016-05-05 23:39:33 +01:00 • committed by David S. Miller
commit 25a54342fd
1 changed files with 3 additions and 0 deletions
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3
tools/net/bpf_jit_disasm.c
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@ -98,6 +98,9 @@ static char *get_klog_buff(unsigned int *klen)
char *buff;
len = klogctl(CMD_ACTION_SIZE_BUFFER, NULL, 0);
if (len < 0)
return NULL;
buff = malloc(len);
if (!buff)
return NULL;