drm/i915/display: Fix an unsigned subtraction which can never be negative.

[ Upstream commit 53b3495273282aa844c4613d19c3b30558c70c84 ]

smatch warning:
drivers/gpu/drm/i915/display/intel_dmc.c:601 parse_dmc_fw() warn:
unsigned 'fw->size - offset' is never less than zero

Firmware size is size_t and offset is u32. So the subtraction is
unsigned which can never be less than zero.

Fixes: 3d5928a168a9 ("drm/i915/xelpd: Pipe A DMC plugging")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211210044129.12422-1-harshit.m.mogalapalli@oracle.com
(cherry picked from commit 87bb2a410dcfb617b88e4695edf4beb6336dc314)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index b3c8e1c450efb6dc8375adb022ebccc9a1c712ba..73076737add759d48fcb84e7091f9afc911354be 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -606,7 +606,7 @@ static void parse_dmc_fw(struct drm_i915_private *dev_priv,
                        continue;
 
                offset = readcount + dmc->dmc_info[id].dmc_offset * 4;
-               if (fw->size - offset < 0) {
+               if (offset > fw->size) {
                        drm_err(&dev_priv->drm, "Reading beyond the fw_size\n");
                        continue;
                }