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[for-next][PATCH 6/8] tracing: Reset parser->buffer to allow multiple "puts"

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From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

trace_parser_put() simply frees the allocated parser buffer. But it does not
reset the pointer that was freed. This means that if trace_parser_put() is
called on the same parser more than once, it will corrupt the allocation
system. Setting parser->buffer to NULL after free allows it to be called
more than once without any ill effect.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d7449783987a..4589b67168fc 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1193,6 +1193,7 @@ int trace_parser_get_init(struct trace_parser *parser, int size)
 void trace_parser_put(struct trace_parser *parser)
 {
 	kfree(parser->buffer);
+	parser->buffer = NULL;
 }
 
 /*
-- 
2.10.2

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[for-next][PATCH 0/8] tracing: Clean up hash logic for set_graph_function Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 1/8] tracing: Add ftrace_hash_key() helper function Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 3/8] ftrace: Replace (void *)1 with a meaningful macro name  FTRACE_GRAPH_EMPTY Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 7/8] ftrace: Do not hold references of ftrace_graph_{notrace_}hash out of  graph_lock Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 8/8] ftrace: Have set_graph_function handle multiple functions in one  write Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 4/8] ftrace: Reset fgd->hash in ftrace_graph_write() Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
    Re: [for-next][PATCH 4/8] ftrace: Reset fgd->hash in ftrace_graph_write() Namhyung Kim <namhyung@kernel.org> - 2017-02-03 16:00 +0100
      Re: [for-next][PATCH 4/8] ftrace: Reset fgd->hash in  ftrace_graph_write() Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 16:00 +0100
  [for-next][PATCH 2/8] ftrace: Create a slight optimization on searching the ftrace_hash Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
    Re: [for-next][PATCH 2/8] ftrace: Create a slight optimization on  searching the ftrace_hash Namhyung Kim <namhyung@kernel.org> - 2017-02-03 15:30 +0100
      Re: [for-next][PATCH 2/8] ftrace: Create a slight optimization on  searching the ftrace_hash Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 16:00 +0100
  [for-next][PATCH 6/8] tracing: Reset parser->buffer to allow multiple "puts" Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  [for-next][PATCH 5/8] ftrace: Have set_graph_functions handle write with RDWR Steven Rostedt <rostedt@goodmis.org> - 2017-02-03 14:50 +0100
  Re: [for-next][PATCH 0/8] tracing: Clean up hash logic for set_graph_function Namhyung Kim <namhyung@kernel.org> - 2017-02-03 16:20 +0100

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