linux-kernel - [PATCH] fprobe: Check rethook_alloc() return in rethook initialization

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Date:   Tue, 25 Oct 2022 00:12:08 -0300
From:   Rafael Mendonca <rafaelmendsr@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Rafael Mendonca <rafaelmendsr@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fprobe: Check rethook_alloc() return in rethook initialization

Check if fp->rethook succeeded to be allocated. Otherwise, if
rethook_alloc() fails, then we end up dereferencing a NULL pointer in
rethook_add_node().

Fixes: 5b0ab78998e3 ("fprobe: Add exit_handler support")
Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
---
 kernel/trace/fprobe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c
index aac63ca9c3d1..71614b2a67ff 100644
--- a/kernel/trace/fprobe.c
+++ b/kernel/trace/fprobe.c
@@ -141,6 +141,8 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
 		return -E2BIG;
 
 	fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler);
+	if (!fp->rethook)
+		return -ENOMEM;
 	for (i = 0; i < size; i++) {
 		struct fprobe_rethook_node *node;
 
-- 
2.34.1