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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jordan Crouse <jcrouse@codeaurora.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
	Rob Clark <robdclark@chromium.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org
Subject: [PATCH AUTOSEL 5.2 076/171] drm/msm/adreno: Ensure that the zap shader region is big enough
Date: Thu, 18 Jul 2019 23:55:07 -0400
Message-ID: <20190719035643.14300-76-sashal@kernel.org> (raw)
In-Reply-To: <20190719035643.14300-1-sashal@kernel.org>

From: Jordan Crouse <jcrouse@codeaurora.org>

[ Upstream commit 6672e11cad662ce6631e04c38f92a140a99c042c ]

Before loading the zap shader we should ensure that the reserved memory
region is big enough to hold the loaded file.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index a9c0ac937b00..9acbbc0f3232 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -56,7 +56,6 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
 		return ret;
 
 	mem_phys = r.start;
-	mem_size = resource_size(&r);
 
 	/* Request the MDT file for the firmware */
 	fw = adreno_request_fw(to_adreno_gpu(gpu), fwname);
@@ -72,6 +71,13 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
 		goto out;
 	}
 
+	if (mem_size > resource_size(&r)) {
+		DRM_DEV_ERROR(dev,
+			"memory region is too small to load the MDT\n");
+		ret = -E2BIG;
+		goto out;
+	}
+
 	/* Allocate memory for the firmware image */
 	mem_region = memremap(mem_phys, mem_size,  MEMREMAP_WC);
 	if (!mem_region) {
-- 
2.20.1


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190719035643.14300-1-sashal@kernel.org>
2019-07-19  3:54 ` [PATCH AUTOSEL 5.2 016/171] drm/msm/a6xx: Check for ERR or NULL before iounmap Sasha Levin
2019-07-19  3:54 ` [PATCH AUTOSEL 5.2 020/171] drm/msm/a6xx: Avoid freeing gmu resources multiple times Sasha Levin
2019-07-19  3:54 ` [PATCH AUTOSEL 5.2 049/171] tty: serial: msm_serial: avoid system lockup condition Sasha Levin
2019-07-19  3:55 ` Sasha Levin [this message]
2019-07-19  3:55 ` [PATCH AUTOSEL 5.2 078/171] drm/msm: Depopulate platform on probe failure Sasha Levin

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