linux-kernel - [PATCH 1/1] drm/mga: Fix error return code in mga_do_pci_dma

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Message-ID: <20210508035554.2424-1-thunder.leizhen@huawei.com>
Date:   Sat, 8 May 2021 11:55:54 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/1] drm/mga: Fix error return code in mga_do_pci_dma_bootstrap()

The user may incorrectly set the value of dma_bs->secondary_bin_count to 0.
In this case, the for loop is not entered and the 'err' value remains 0.

Fixes: 6795c985a648 ("Add support for PCI MGA cards to MGA DRM.")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/gpu/drm/mga/mga_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mga/mga_dma.c b/drivers/gpu/drm/mga/mga_dma.c
index 1cb7d120d18f..e41d44ec26de 100644
--- a/drivers/gpu/drm/mga/mga_dma.c
+++ b/drivers/gpu/drm/mga/mga_dma.c
@@ -693,7 +693,7 @@ static int mga_do_pci_dma_bootstrap(struct drm_device *dev,
 	}
 
 	if (bin_count == 0) {
-		DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
+		DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err ? : -EINVAL);
 		return err;
 	}
 
-- 
2.25.1