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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-07-05 09:45:43 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-07-05 09:52:18 -0400 |
| commit | 69d71879d2cf67a381055f698a1d7def00dc4ed7 (patch) | |
| tree | bfca8b6145348c973eb6c880e614c22a6a2065e0 | |
| parent | 4dce17b26b6ac3bf29aa0eae1d28e14debe37747 (diff) | |
| download | linux-69d71879d2cf67a381055f698a1d7def00dc4ed7.tar.bz2 | |
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: 8c08f0d5c6fb ("ftrace: Have cached module filters be an active filter")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/ftrace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index f8c18f15b190..2953d558bbee 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -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; |