linux-kernel - [GIT PULL] tracing/dynevent: Fix a memory leak in an error handling path

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Date:   Tue, 13 Apr 2021 20:37:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [GIT PULL] tracing/dynevent: Fix a memory leak in an error handling
 path

Christophe JAILLET <christophe.jaillet@...adoo.fr>

Linus,

tracing/dynevent: Fix a memory link in dyn_event_release()

An error path exited the function before freeing the allocated
"argv" variable.


Please pull the latest trace-v5.12-rc7 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v5.12-rc7

Tag SHA1: 682c26c6e8cf02be8c898a712bbd5ffd75c83616
Head SHA1: 8db403b9631331ef1d5e302cdf353c48849ca9d5


Christophe JAILLET (1):
      tracing/dynevent: Fix a memory leak in an error handling path

----
 kernel/trace/trace_dynevent.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---------------------------
commit 8db403b9631331ef1d5e302cdf353c48849ca9d5
Author: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Date:   Sun Apr 11 12:21:54 2021 +0200

    tracing/dynevent: Fix a memory leak in an error handling path
    
    We must free 'argv' before returning, as already done in all the other
    paths of this function.
    
    Link: https://lkml.kernel.org/r/21e3594ccd7fc88c5c162c98450409190f304327.1618136448.git.christophe.jaillet@wanadoo.fr
    
    Fixes: d262271d0483 ("tracing/dynevent: Delegate parsing to create function")
    Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
    Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
    Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index dc971a68dda4..e57cc0870892 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -63,8 +63,10 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
 		event = p + 1;
 		*p = '\0';
 	}
-	if (event[0] == '\0')
-		return -EINVAL;
+	if (event[0] == '\0') {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	mutex_lock(&event_mutex);
 	for_each_dyn_event_safe(pos, n) {