linux-kernel - [PATCH 5.10 23/67] drm/amdgpu: Avoid printing of stack contents on firmware load error

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Message-Id: <20210802134339.807165343@linuxfoundation.org>
Date:   Mon,  2 Aug 2021 15:44:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vojtech Pavlik <vojtech@....cz>,
        Jiri Kosina <jkosina@...e.cz>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.10 23/67] drm/amdgpu: Avoid printing of stack contents on firmware load error

From: Jiri Kosina <jkosina@...e.cz>

commit 6aade587d329ebe88319dfdb8e8c7b6aede80417 upstream.

In case when psp_init_asd_microcode() fails to load ASD microcode file,
psp_v12_0_init_microcode() tries to print the firmware filename that
failed to load before bailing out.

This is wrong because:

- the firmware filename it would want it print is an incorrect one as
  psp_init_asd_microcode() and psp_v12_0_init_microcode() are loading
  different filenames
- it tries to print fw_name, but that's not yet been initialized by that
  time, so it prints random stack contents, e.g.

    amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_asd.bin failed with error -2
    amdgpu 0000:04:00.0: amdgpu: fail to initialize asd microcode
    amdgpu 0000:04:00.0: amdgpu: psp v12.0: Failed to load firmware "\xfeTO\x8e\xff\xff"

Fix that by bailing out immediately, instead of priting the bogus error
message.

Reported-by: Vojtech Pavlik <vojtech@....cz>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/amdgpu/psp_v12_0.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
@@ -67,7 +67,7 @@ static int psp_v12_0_init_microcode(stru
 
 	err = psp_init_asd_microcode(psp, chip_name);
 	if (err)
-		goto out;
+		return err;
 
 	snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_ta.bin", chip_name);
 	err = request_firmware(&adev->psp.ta_fw, fw_name, adev->dev);
@@ -80,7 +80,7 @@ static int psp_v12_0_init_microcode(stru
 	} else {
 		err = amdgpu_ucode_validate(adev->psp.ta_fw);
 		if (err)
-			goto out2;
+			goto out;
 
 		ta_hdr = (const struct ta_firmware_header_v1_0 *)
 				 adev->psp.ta_fw->data;
@@ -105,10 +105,9 @@ static int psp_v12_0_init_microcode(stru
 
 	return 0;
 
-out2:
+out:
 	release_firmware(adev->psp.ta_fw);
 	adev->psp.ta_fw = NULL;
-out:
 	if (err) {
 		dev_err(adev->dev,
 			"psp v12.0: Failed to load firmware \"%s\"\n",