linux-kernel - [PATCH 5.17 0351/1126] media: ti-vpe: cal: Fix a NULL pointer dereference in cal_ctx_v4l2_init

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Date:   Tue,  5 Apr 2022 09:18:18 +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, Zhou Qingyang <zhou1615@....edu>,
        Pratyush Yadav <p.yadav@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 0351/1126] media: ti-vpe: cal: Fix a NULL pointer dereference in cal_ctx_v4l2_init_formats()

From: Zhou Qingyang <zhou1615@....edu>

[ Upstream commit abd77889851d2ead0d0c9c4d29f1808801477b00 ]

In cal_ctx_v4l2_init_formats(), devm_kzalloc() is assigned to
ctx->active_fmt and there is a dereference of it after that, which could
lead to NULL pointer dereference on failure of devm_kzalloc().

Fix this bug by adding a NULL check of ctx->active_fmt.

This bug was found by a static analyzer.

Builds with 'make allyesconfig' show no new warnings, and our static
analyzer no longer warns about this code.

Fixes: 7168155002cf ("media: ti-vpe: cal: Move format handling to cal.c and expose helpers")
Signed-off-by: Zhou Qingyang <zhou1615@....edu>
Reviewed-by: Pratyush Yadav <p.yadav@...com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/ti-vpe/cal-video.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/ti-vpe/cal-video.c b/drivers/media/platform/ti-vpe/cal-video.c
index 7799da1cc261..3e936a2ca36c 100644
--- a/drivers/media/platform/ti-vpe/cal-video.c
+++ b/drivers/media/platform/ti-vpe/cal-video.c
@@ -823,6 +823,9 @@ static int cal_ctx_v4l2_init_formats(struct cal_ctx *ctx)
 	/* Enumerate sub device formats and enable all matching local formats */
 	ctx->active_fmt = devm_kcalloc(ctx->cal->dev, cal_num_formats,
 				       sizeof(*ctx->active_fmt), GFP_KERNEL);
+	if (!ctx->active_fmt)
+		return -ENOMEM;
+
 	ctx->num_active_fmt = 0;
 
 	for (j = 0, i = 0; ; ++j) {
-- 
2.34.1