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Subject[PATCH 5.3 015/140] ASoC: SOF: Intel: initialise and verify FW crash dump data.
Date
From: Liam Girdwood <liam.r.girdwood@linux.intel.com>

[ Upstream commit ff2be865633e6fa523cd2db3b73197d795dec991 ]

FW mailbox offset was not set before use and HDR size was not validated.
Fix this.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190927200538.660-12-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/sof/intel/bdw.c | 7 +++++++
sound/soc/sof/intel/byt.c | 6 ++++++
sound/soc/sof/intel/hda.c | 7 +++++++
3 files changed, 20 insertions(+)

diff --git a/sound/soc/sof/intel/bdw.c b/sound/soc/sof/intel/bdw.c
index 70d524ef9bc07..0ca3c1b55eeb1 100644
--- a/sound/soc/sof/intel/bdw.c
+++ b/sound/soc/sof/intel/bdw.c
@@ -37,6 +37,7 @@
#define MBOX_SIZE 0x1000
#define MBOX_DUMP_SIZE 0x30
#define EXCEPT_OFFSET 0x800
+#define EXCEPT_MAX_HDR_SIZE 0x400

/* DSP peripherals */
#define DMAC0_OFFSET 0xFE000
@@ -228,6 +229,11 @@ static void bdw_get_registers(struct snd_sof_dev *sdev,
/* note: variable AR register array is not read */

/* then get panic info */
+ if (xoops->arch_hdr.totalsize > EXCEPT_MAX_HDR_SIZE) {
+ dev_err(sdev->dev, "invalid header size 0x%x. FW oops is bogus\n",
+ xoops->arch_hdr.totalsize);
+ return;
+ }
offset += xoops->arch_hdr.totalsize;
sof_mailbox_read(sdev, offset, panic_info, sizeof(*panic_info));

@@ -588,6 +594,7 @@ static int bdw_probe(struct snd_sof_dev *sdev)
/* TODO: add offsets */
sdev->mmio_bar = BDW_DSP_BAR;
sdev->mailbox_bar = BDW_DSP_BAR;
+ sdev->dsp_oops_offset = MBOX_OFFSET;

/* PCI base */
mmio = platform_get_resource(pdev, IORESOURCE_MEM,
diff --git a/sound/soc/sof/intel/byt.c b/sound/soc/sof/intel/byt.c
index 107d711efc3f0..96faaa8fa5a3a 100644
--- a/sound/soc/sof/intel/byt.c
+++ b/sound/soc/sof/intel/byt.c
@@ -28,6 +28,7 @@
#define MBOX_OFFSET 0x144000
#define MBOX_SIZE 0x1000
#define EXCEPT_OFFSET 0x800
+#define EXCEPT_MAX_HDR_SIZE 0x400

/* DSP peripherals */
#define DMAC0_OFFSET 0x098000
@@ -273,6 +274,11 @@ static void byt_get_registers(struct snd_sof_dev *sdev,
/* note: variable AR register array is not read */

/* then get panic info */
+ if (xoops->arch_hdr.totalsize > EXCEPT_MAX_HDR_SIZE) {
+ dev_err(sdev->dev, "invalid header size 0x%x. FW oops is bogus\n",
+ xoops->arch_hdr.totalsize);
+ return;
+ }
offset += xoops->arch_hdr.totalsize;
sof_mailbox_read(sdev, offset, panic_info, sizeof(*panic_info));

diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index 7f665392618f6..f2d45d62dfa56 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -37,6 +37,8 @@
#define IS_CFL(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0xa348)
#define IS_CNL(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0x9dc8)

+#define EXCEPT_MAX_HDR_SIZE 0x400
+
/*
* Debug
*/
@@ -121,6 +123,11 @@ static void hda_dsp_get_registers(struct snd_sof_dev *sdev,
/* note: variable AR register array is not read */

/* then get panic info */
+ if (xoops->arch_hdr.totalsize > EXCEPT_MAX_HDR_SIZE) {
+ dev_err(sdev->dev, "invalid header size 0x%x. FW oops is bogus\n",
+ xoops->arch_hdr.totalsize);
+ return;
+ }
offset += xoops->arch_hdr.totalsize;
sof_block_read(sdev, sdev->mmio_bar, offset,
panic_info, sizeof(*panic_info));
--
2.20.1


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