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tracing/filters: fix NULL pointer dereference 

Try this, and you'll see NULL pointer dereference bug:

  # echo -n 'parent_comm ==' > sched/sched_process_fork/filter

Because we passed NULL ptr to simple_strtoull().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <49E04C43.1050504@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-04-11 15:52:35 +08:00 committed by Ingo Molnar
parent 8433a40eb7
commit bcabd91c27
1 changed files with 5 additions and 0 deletions
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5
kernel/trace/trace_events_filter.c
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@ -410,6 +410,11 @@ int filter_parse(char **pbuf, struct filter_pred *pred)
}
}
if (!val_str) {
pred->field_name = NULL;
return -EINVAL;
}
pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
if (!pred->field_name)
return -ENOMEM;