[PATCH] ftrace: advance readpos in trace_seq_to_user() by really read bytes

[Vitaly Mayatskikh]

If tracer will not provide input buffer of enough size, he will never
see data between cnt and len bytes.

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 17bb88d..0217615 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -477,7 +477,7 @@ ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
 	if (ret)
 		return -EFAULT;
 
-	s->readpos += len;
+	s->readpos += cnt;
 	return cnt;
 }
 

-- 
wbr, Vitaly
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