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ftrace: Test for NULL iter->tr in regex for stack_trace_filter changes 

As writing into stack_trace_filter, the iter-tr is not set and is NULL.
Check if it is NULL before dereferencing it in ftrace_regex_release().

Fixes: 8c08f0d5c6 ("ftrace: Have cached module filters be an active filter")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-07-05 09:45:43 -04:00
parent 4dce17b26b
commit 69d71879d2
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/ftrace.c
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@ -5043,7 +5043,7 @@ int ftrace_regex_release(struct inode *inode, struct file *file)
if (filter_hash) {
orig_hash = &iter->ops->func_hash->filter_hash;
if (!list_empty(&iter->tr->mod_trace))
if (iter->tr && !list_empty(&iter->tr->mod_trace))
iter->hash->flags |= FTRACE_HASH_FL_MOD;
} else
orig_hash = &iter->ops->func_hash->notrace_hash;