[PATCH 1/2] ftrace: Fix NULL pointer dereference in t_probe_next()
Naveen N. Rao
naveen.n.rao at linux.vnet.ibm.com
Wed Sep 4 18:07:50 AEST 2019
Steven Rostedt wrote:
> On Thu, 4 Jul 2019 20:04:41 +0530
> "Naveen N. Rao" <naveen.n.rao at linux.vnet.ibm.com> wrote:
>
>
>> kernel/trace/ftrace.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
>> index 7b037295a1f1..0791eafb693d 100644
>> --- a/kernel/trace/ftrace.c
>> +++ b/kernel/trace/ftrace.c
>> @@ -3093,6 +3093,10 @@ t_probe_next(struct seq_file *m, loff_t *pos)
>> hnd = &iter->probe_entry->hlist;
>>
>> hash = iter->probe->ops.func_hash->filter_hash;
>> +
>> + if (!hash)
>> + return NULL;
>> +
>> size = 1 << hash->size_bits;
>>
>> retry:
>
> OK, I added this, but I'm also adding this on top:
Thanks, the additional comments do make this much clearer.
Regards,
Naveen
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