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drm: vc4: Fix possible null pointer dereference
author
Aleksandr Mishin
<amishin@t-argos.ru>
Tue, 9 Apr 2024 07:56:22 +0000
(10:56 +0300)
committer
Maxime Ripard
<mripard@kernel.org>
Mon, 15 Apr 2024 07:13:10 +0000
(09:13 +0200)
In vc4_hdmi_audio_init() of_get_address() may return
NULL which is later dereferenced. Fix this bug by adding NULL check.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes:
bb7d78568814
("drm/vc4: Add HDMI audio support")
Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link:
https://patchwork.freedesktop.org/patch/msgid/20240409075622.11783-1-amishin@t-argos.ru
drivers/gpu/drm/vc4/vc4_hdmi.c
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diff --git
a/drivers/gpu/drm/vc4/vc4_hdmi.c
b/drivers/gpu/drm/vc4/vc4_hdmi.c
index d8751ea2030329ccd1cc7ab4b72dd7b9fe63538f..5f8d51b293705e397a5aa8c166d8de712663f7de 100644
(file)
--- a/
drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/
drivers/gpu/drm/vc4/vc4_hdmi.c
@@
-2740,6
+2740,8
@@
static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
index = 1;
addr = of_get_address(dev->of_node, index, NULL, NULL);
+ if (!addr)
+ return -EINVAL;
vc4_hdmi->audio.dma_data.addr = be32_to_cpup(addr) + mai_data->offset;
vc4_hdmi->audio.dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;