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Subject[PATCH 2/8] ftrace: Fix possible NULL dereferencing in __ftrace_hash_rec_update
Date
We need to check the existence of the other_hash before
we touch its count variable.

This issue is hit only when non global ftrace_ops is used.
The global ftrace_ops is initialized with empty hashes.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
kernel/trace/ftrace.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 09007c0..7eb702f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1372,7 +1372,8 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
if (filter_hash && in_hash && !in_other_hash)
match = 1;
else if (!filter_hash && in_hash &&
- (in_other_hash || !other_hash->count))
+ (in_other_hash ||
+ !other_hash || !other_hash->count))
match = 1;
}
if (!match)
--
1.7.1


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