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Date:   Thu, 24 Jun 2021 13:11:36 +0200 (CEST)
From:   Jiri Kosina <jikos@kernel.org>
To:     Alex Deucher <alexander.deucher@amd.com>,
        =?ISO-8859-15?Q?Christian_K=F6nig?= <christian.koenig@amd.com>,
        David Airlie <airlied@linux.ie>
cc:     amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Vojtech Pavlik <vojtech@ucw.cz>
Subject: [PATCH v2] drm/amdgpu: Avoid printing of stack contents on firmware
 load error
In-Reply-To: <YNRnDTD1fdpZOXB8@suse.com>
Message-ID: <nycvar.YFH.7.76.2106241310000.18969@cbobk.fhfr.pm>
References: <nycvar.YFH.7.76.2106241135440.18969@cbobk.fhfr.pm> <YNRnDTD1fdpZOXB8@suse.com>
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From: Jiri Kosina <jkosina@suse.cz>

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@ucw.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

v1 -> v2: remove now-unused label

 drivers/gpu/drm/amd/amdgpu/psp_v12_0.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
index c4828bd3264b..b0ee77ee80b9 100644
--- 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(struct psp_context *psp)
 
 	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(struct psp_context *psp)
 	} 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(struct psp_context *psp)
 
 	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",
-- 
2.12.3