linux-kernel - [PATCH] tracing: Fix allocation of printing set

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Message-ID: <20250121151236.47fcf433@gandalf.local.home>
Date: Tue, 21 Jan 2025 15:12:36 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Sasha Levin <sashal@...nel.org>, Linus
 Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] tracing: Fix allocation of printing set_event file content

From: Steven Rostedt <rostedt@...dmis.org>

The adding of cached events for modules not loaded yet required a
descriptor to separate the iteration of events with the iteration of
cached events for a module. But the allocation used the size of the
pointer and not the size of the contents to allocate its data and caused a
slab-out-of-bounds.

Reported-by: Sasha Levin <sashal@...nel.org>
Closes: https://lore.kernel.org/all/Z4_OHKESRSiJcr-b@lappy/
Fixes: b355247df104e ("tracing: Cache ":mod:" events for modules not loaded yet")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 51c5014877e8..5217dcddcb4c 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1588,7 +1588,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 	struct set_event_iter *iter;
 	loff_t l;
 
-	iter = kzalloc(sizeof(iter), GFP_KERNEL);
+	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
 	if (!iter)
 		return NULL;
 
-- 
2.45.2