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tracing: fix leak in event_format_read()

Browse source 
Impact: fix memory leak

If event_format_read() exits early due to nonzero ppos, the
previous kmalloc doesn't get freed - might as well do the
check before the kmalloc and avoid the problem.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237270859.8033.141.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-03-17 01:20:59 -05:00 committed by Ingo Molnar
parent e410613334
commit c269fc8c53
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/trace_events.c
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@ -378,15 +378,15 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
char *buf;
int r;
if (*ppos)
return 0;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
trace_seq_init(s);
if (*ppos)
return 0;
/* If any of the first writes fail, so will the show_format. */
trace_seq_printf(s, "name: %s\n", call->name);