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Commit 69d71879 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

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: 8c08f0d5 ("ftrace: Have cached module filters be an active filter")
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 4dce17b2

kernel/trace/ftrace.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -5043,7 +5043,7 @@ int ftrace_regex_release(struct inode *inode, struct file *file) 




		if (filter_hash) {

		if (filter_hash) {

			orig_hash = &iter->ops->func_hash->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;

				iter->hash->flags |= FTRACE_HASH_FL_MOD;

		} else

		} else

			orig_hash = &iter->ops->func_hash->notrace_hash;

			orig_hash = &iter->ops->func_hash->notrace_hash;