Re: [PATCH 15/38] trace-cmd lib: check the return value of do_lssek() in trace_get_options()

[Jerome Marchand <jmarchan@redhat.com>]

On 17/07/2024 23:10, Steven Rostedt wrote:
> 
> Note the subject has a typo "lssek".
> 
> 
> On Wed,  5 Jun 2024 15:40:30 +0200
> "Jerome Marchand" <jmarchan@redhat.com> wrote:
> 
>> Check that do_lseek doesn't fail before calling malloc() with a -1
>> argument.
>>
>> This is flagged as an overrun error (CWE-119) by static anaysis
>> because of the call to read() later, but I don't imagine that malloc
>> would succeed.
>>
>> Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
>> ---
>>   lib/trace-cmd/trace-output.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
>> index 5ba0a145..35904620 100644
>> --- a/lib/trace-cmd/trace-output.c
>> +++ b/lib/trace-cmd/trace-output.c
>> @@ -2069,6 +2069,8 @@ __hidden void *trace_get_options(struct tracecmd_output *handle, size_t *len)
>>   	}
>>   
>>   	offset = do_lseek(&out_handle, 0, SEEK_CUR);
>> +	if(offset == (off_t)-1)
> 
> Nit, the above has whitespace issues:
> 
> 	if (offset == (off_t)-1)
> 
> Could you resend this?

Will do.

Jerome

> 
> Thanks,
> 
> -- Steve
> 
>> +		goto out;
>>   	buf = malloc(offset);
>>   	if (!buf)
>>   		goto out;
>