linux-kernel - [PATCH AUTOSEL 5.18 087/159] drm/tegra: gem: Do not try to dereference ERR

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Message-Id: <20220530132425.1929512-87-sashal@kernel.org>
Date:   Mon, 30 May 2022 09:23:12 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thierry Reding <treding@...dia.com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Sasha Levin <sashal@...nel.org>, thierry.reding@...il.com,
        airlied@...ux.ie, daniel@...ll.ch, jonathanh@...dia.com,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 087/159] drm/tegra: gem: Do not try to dereference ERR_PTR()

From: Thierry Reding <treding@...dia.com>

[ Upstream commit cb7e1abc2c73633e1eefa168ab2dad6e838899c9 ]

When mapping the DMA-BUF attachment fails, map->sgt will be an ERR_PTR-
encoded error code and the cleanup code would try to free that memory,
which obviously would fail.

Zero out that pointer after extracting the error code when this happens
so that kfree() can do the right thing.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/tegra/gem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 0063403ab5e1..7c7dd84e6db8 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -88,6 +88,7 @@ static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_
 		if (IS_ERR(map->sgt)) {
 			dma_buf_detach(buf, map->attach);
 			err = PTR_ERR(map->sgt);
+			map->sgt = NULL;
 			goto free;
 		}
 
-- 
2.35.1