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Message-ID: <00000000000047c963060a943a54@google.com>
Date: Mon, 20 Nov 2023 04:00:09 -0800
From: syzbot <syzbot+2e93e6fb36e6fdc56574@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test divide err in drm
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Subject: [PATCH] Test divide err in drm
Author: eadavis@...com
please test divide err in drm
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ac347a0655db
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index ac9a406250c5..117ee4e41c63 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -36,6 +36,7 @@
#include <linux/list.h>
#include <linux/list_sort.h>
#include <linux/of.h>
+#include <linux/overflow.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
@@ -1297,8 +1298,11 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode)
num *= 2;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
den *= 2;
- if (mode->vscan > 1)
+ if (mode->vscan > 1) {
+ if (unlikely(check_mul_overflow(den, mode->vscan, &den)))
+ return 0;
den *= mode->vscan;
+ }
return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
}
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