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From: Jiawei Gu <Jiawei.Gu@amd.com>
To: <amd-gfx@lists.freedesktop.org>
Cc: emily.deng@amd.com, Jiawei Gu <Jiawei.Gu@amd.com>
Subject: [PATCH] drm/amdgpu: fix potential NULL pointer when check_atom_bios() fails
Date: Thu, 31 Dec 2020 16:47:41 +0800	[thread overview]
Message-ID: <20201231084741.11865-1-Jiawei.Gu@amd.com> (raw)

Asic funcs pointer needs being checked whether is NULL. Because when
check_atom_bios() fails in req_init_data handshake, asic funcs pointer
is not initialized yet.

Signed-off-by: Jiawei Gu <Jiawei.Gu@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
index 6333cada1e09..efdf639f6593 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -155,7 +155,7 @@ static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
 	u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
 	int len;
 
-	if (!adev->asic_funcs->read_bios_from_rom)
+	if (!adev->asic_funcs || !adev->asic_funcs->read_bios_from_rom)
 		return false;
 
 	/* validate VBIOS signature */
@@ -348,7 +348,8 @@ static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
 	if (adev->flags & AMD_IS_APU)
 		return igp_read_bios_from_vram(adev);
 	else
-		return amdgpu_asic_read_disabled_bios(adev);
+		return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?
+			false : amdgpu_asic_read_disabled_bios(adev);
 }
 
 #ifdef CONFIG_ACPI
-- 
2.17.1

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             reply	other threads:[~2020-12-31  8:48 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-31  8:47 Jiawei Gu [this message]
2021-01-03 16:10 ` [PATCH] drm/amdgpu: fix potential NULL pointer when check_atom_bios() fails Christian König

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