From: Lucas De Marchi lucas.demarchi@intel.com

While loading the DMC firmware we were double checking the headers made sense, but in no place we checked that we were actually reading memory we were supposed to. This could be wrong in case the firmware file is truncated or malformed.

Before this patch: # ls -l /lib/firmware/i915/icl_dmc_ver1_07.bin -rw-r--r-- 1 root root 25716 Feb 1 12:26 icl_dmc_ver1_07.bin # truncate -s 25700 /lib/firmware/i915/icl_dmc_ver1_07.bin # modprobe i915 # dmesg| grep -i dmc [drm:intel_csr_ucode_init [i915]] Loading i915/icl_dmc_ver1_07.bin [drm] Finished loading DMC firmware i915/icl_dmc_ver1_07.bin (v1.7)

i.e. it loads random data. Now it fails like below: [drm:intel_csr_ucode_init [i915]] Loading i915/icl_dmc_ver1_07.bin [drm:csr_load_work_fn [i915]] *ERROR* Truncated DMC firmware, rejecting. i915 0000:00:02.0: Failed to load DMC firmware i915/icl_dmc_ver1_07.bin. Disabling runtime power management. i915 0000:00:02.0: DMC firmware homepage: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/...

Before reading any part of the firmware file, validate the input first.

Fixes: eb805623d8b1 ("drm/i915/skl: Add support to load SKL CSR firmware.") Cc: stable@vger.kernel.org Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com Reviewed-by: Rodrigo Vivi rodrigo.vivi@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20190605235535.17791-1-lucas.d... (cherry picked from commit bc7b488b1d1c71dc4c5182206911127bc6c410d6) Signed-off-by: Jani Nikula jani.nikula@intel.com --- drivers/gpu/drm/i915/intel_csr.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c index f43c2a2563a5..96618af47088 100644 --- a/drivers/gpu/drm/i915/intel_csr.c +++ b/drivers/gpu/drm/i915/intel_csr.c @@ -303,10 +303,17 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, u32 dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes; u32 i; u32 *dmc_payload; + size_t fsize;

if (!fw) return NULL;

+ fsize = sizeof(struct intel_css_header) + + sizeof(struct intel_package_header) + + sizeof(struct intel_dmc_header); + if (fsize > fw->size) + goto error_truncated; + /* Extract CSS Header information*/ css_header = (struct intel_css_header *)fw->data; if (sizeof(struct intel_css_header) != @@ -366,6 +373,9 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, /* Convert dmc_offset into number of bytes. By default it is in dwords*/ dmc_offset *= 4; readcount += dmc_offset; + fsize += dmc_offset; + if (fsize > fw->size) + goto error_truncated;

/* Extract dmc_header information. */ dmc_header = (struct intel_dmc_header *)&fw->data[readcount]; @@ -397,6 +407,10 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv,

/* fw_size is in dwords, so multiplied by 4 to convert into bytes. */ nbytes = dmc_header->fw_size * 4; + fsize += nbytes; + if (fsize > fw->size) + goto error_truncated; + if (nbytes > csr->max_fw_size) { DRM_ERROR("DMC FW too big (%u bytes)\n", nbytes); return NULL; @@ -410,6 +424,10 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, }

return memcpy(dmc_payload, &fw->data[readcount], nbytes); + +error_truncated: + DRM_ERROR("Truncated DMC firmware, rejecting.\n"); + return NULL; }

static void intel_csr_runtime_pm_get(struct drm_i915_private *dev_priv)