linux-kernel - [for-next][PATCH 02/12] user_events: Fix potential uninitialized pointer while parsing field

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Date:   Sat, 12 Mar 2022 18:25:27 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Beau Belgrave <beaub@...ux.microsoft.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [for-next][PATCH 02/12] user_events: Fix potential uninitialized pointer while parsing field

From: Beau Belgrave <beaub@...ux.microsoft.com>

Ensure name is initialized by default to NULL to prevent possible edge
cases that could lead to it being left uninitialized. Add an explicit
check for NULL name to ensure edge boundaries.

Link: https://lore.kernel.org/bpf/20220224105334.GA2248@kili/
Link: https://lore.kernel.org/linux-trace-devel/20220224181637.2129-1-beaub@linux.microsoft.com

Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_user.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 2b5e9fdb63a0..9a6191a6a786 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -362,6 +362,8 @@ static int user_event_parse_field(char *field, struct user_event *user,
 	*field++ = '\0';
 	depth++;
 parse:
+	name = NULL;
+
 	while ((part = strsep(&field, " ")) != NULL) {
 		switch (depth++) {
 		case FIELD_DEPTH_TYPE:
@@ -382,7 +384,7 @@ static int user_event_parse_field(char *field, struct user_event *user,
 		}
 	}
 
-	if (depth < FIELD_DEPTH_SIZE)
+	if (depth < FIELD_DEPTH_SIZE || !name)
 		return -EINVAL;
 
 	if (depth == FIELD_DEPTH_SIZE)
-- 
2.35.1