linux-kernel - [PATCH 5.10 238/599] media: vidtv: Check for null return of vzalloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220405070305.922931016@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:28:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 238/599] media: vidtv: Check for null return of vzalloc

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit e6a21a14106d9718aa4f8e115b1e474888eeba44 ]

As the possible failure of the vzalloc(), e->encoder_buf might be NULL.
Therefore, it should be better to check it in order
to guarantee the success of the initialization.
If fails, we need to free not only 'e' but also 'e->name'.
Also, if the allocation for ctx fails, we need to free 'e->encoder_buf'
else.

Fixes: f90cf6079bf6 ("media: vidtv: add a bridge driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/test-drivers/vidtv/vidtv_s302m.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.c b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
index d79b65854627..4676083cee3b 100644
--- a/drivers/media/test-drivers/vidtv/vidtv_s302m.c
+++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
@@ -455,6 +455,9 @@ struct vidtv_encoder
 		e->name = kstrdup(args.name, GFP_KERNEL);
 
 	e->encoder_buf = vzalloc(VIDTV_S302M_BUF_SZ);
+	if (!e->encoder_buf)
+		goto out_kfree_e;
+
 	e->encoder_buf_sz = VIDTV_S302M_BUF_SZ;
 	e->encoder_buf_offset = 0;
 
@@ -467,10 +470,8 @@ struct vidtv_encoder
 	e->is_video_encoder = false;
 
 	ctx = kzalloc(priv_sz, GFP_KERNEL);
-	if (!ctx) {
-		kfree(e);
-		return NULL;
-	}
+	if (!ctx)
+		goto out_kfree_buf;
 
 	e->ctx = ctx;
 	ctx->last_duration = 0;
@@ -498,6 +499,14 @@ struct vidtv_encoder
 	e->next = NULL;
 
 	return e;
+
+out_kfree_buf:
+	kfree(e->encoder_buf);
+
+out_kfree_e:
+	kfree(e->name);
+	kfree(e);
+	return NULL;
 }
 
 void vidtv_s302m_encoder_destroy(struct vidtv_encoder *e)
-- 
2.34.1