From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: "James (Qian) Wang" <james.qian.wang@arm.com>,
Liviu Dudau <liviu.dudau@arm.com>,
Brian Starkey <brian.starkey@arm.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] drm/komeda: Fix potential integer overflow in komeda_crtc_update_clock_ratio
Date: Sun, 11 Aug 2019 19:08:01 -0500 [thread overview]
Message-ID: <20190812000801.GA29204@embeddedor> (raw)
Add suffix ULL to constant 1000 in order to avoid a potential integer
overflow and give the compiler complete information about the proper
arithmetic to use. Notice that this constant is being used in a context
that expects an expression of type u64, but it's currently evaluated
using 32-bit arithmetic.
Addresses-Coverity-ID: 1485796 ("Unintentional integer overflow")
Fixes: ed22c6d9304d ("drm/komeda: Use drm_display_mode "crtc_" prefixed hardware timings")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
index fa9a4593bb37..624d257da20f 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
@@ -27,7 +27,7 @@ static void komeda_crtc_update_clock_ratio(struct komeda_crtc_state *kcrtc_st)
return;
}
- pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000;
+ pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000ULL;
aclk = komeda_crtc_get_aclk(kcrtc_st);
kcrtc_st->clock_ratio = div64_u64(aclk << 32, pxlclk);
--
2.22.0
next reply other threads:[~2019-08-12 0:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 0:08 Gustavo A. R. Silva [this message]
2019-08-12 10:18 ` drm/komeda: Fix potential integer overflow in komeda_crtc_update_clock_ratio james qian wang (Arm Technology China)
2019-08-12 10:18 ` james qian wang (Arm Technology China)
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