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From: Colin King <colin.king@canonical.com>
To: Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Lucas De Marchi <lucas.demarchi@intel.com>,
	Anusha Srivatsa <anusha.srivatsa@intel.com>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] drm/i915/xelpd: Fix unsigned compared to less than zero error
Date: Tue, 20 Jul 2021 16:57:26 +0100	[thread overview]
Message-ID: <20210720155726.73628-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

The subtraction of fw->size - offset is operating on two unsigned
integers and the result is unsigned and hence the less than zero
comparison will always to be false. Fix this by casting fw->size
from a size_t to a ssize_t to ensure the result can be signed to
allow a less than zero result.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 3d5928a168a9 ("drm/i915/xelpd: Pipe A DMC plugging")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index f8789d4543bf..dde1f243d375 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -645,7 +645,7 @@ 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 ((ssize_t)fw->size - offset < 0) {
 			drm_err(&dev_priv->drm, "Reading beyond the fw_size\n");
 			continue;
 		}
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Lucas De Marchi <lucas.demarchi@intel.com>,
	Anusha Srivatsa <anusha.srivatsa@intel.com>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [Intel-gfx] [PATCH][next] drm/i915/xelpd: Fix unsigned compared to less than zero error
Date: Tue, 20 Jul 2021 16:57:26 +0100	[thread overview]
Message-ID: <20210720155726.73628-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

The subtraction of fw->size - offset is operating on two unsigned
integers and the result is unsigned and hence the less than zero
comparison will always to be false. Fix this by casting fw->size
from a size_t to a ssize_t to ensure the result can be signed to
allow a less than zero result.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 3d5928a168a9 ("drm/i915/xelpd: Pipe A DMC plugging")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index f8789d4543bf..dde1f243d375 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -645,7 +645,7 @@ 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 ((ssize_t)fw->size - offset < 0) {
 			drm_err(&dev_priv->drm, "Reading beyond the fw_size\n");
 			continue;
 		}
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

             reply	other threads:[~2021-07-20 16:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-20 15:57 Colin King [this message]
2021-07-20 15:57 ` [Intel-gfx] [PATCH][next] drm/i915/xelpd: Fix unsigned compared to less than zero error Colin King
2021-07-20 16:55 ` [Intel-gfx] ✗ Fi.CI.DOCS: warning for " Patchwork
2021-07-20 17:19 ` [PATCH][next] " Lucas De Marchi
2021-07-20 17:19   ` [Intel-gfx] " Lucas De Marchi
2021-07-20 17:19   ` Lucas De Marchi
2021-07-20 17:20 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2021-07-20 18:59 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork

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