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Subject[tip:perf/core] tracing/kprobe: Fix a memory leak in error case
Commit-ID:  61a527362234ac3352a91ac67c50c6f7cd248eb1
Gitweb: http://git.kernel.org/tip/61a527362234ac3352a91ac67c50c6f7cd248eb1
Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Fri, 27 Aug 2010 20:38:46 +0900
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 8 Sep 2010 11:47:18 -0300

tracing/kprobe: Fix a memory leak in error case

Fix a memory leak which happens when a field name conflicts with others. In
error case, free_trace_probe() will free all arguments until nr_args, so this
increments nr_args the begining of the loop instead of the end.

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100827113846.22882.12670.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
kernel/trace/trace_kprobe.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 8b27c98..0116c03 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -992,6 +992,9 @@ static int create_trace_probe(int argc, char **argv)
/* parse arguments */
ret = 0;
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+ /* Increment count for freeing args in error case */
+ tp->nr_args++;
+
/* Parse argument name */
arg = strchr(argv[i], '=');
if (arg)
@@ -1021,11 +1024,8 @@ static int create_trace_probe(int argc, char **argv)
ret = parse_probe_arg(arg, tp, &tp->args[i], is_return);
if (ret) {
pr_info("Parse error at argument%d. (%d)\n", i, ret);
- kfree(tp->args[i].name);
goto error;
}
-
- tp->nr_args++;
}

ret = register_trace_probe(tp);

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