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From: Paul Gofman <pgofman@codeweavers.com>
To: dri-devel@lists.freedesktop.org
Cc: Paul Gofman <pgofman@codeweavers.com>
Subject: [PATCH libdrm 2/2] include: Avoid potentially infinite loop in log2_int().
Date: Wed, 28 Oct 2020 13:06:02 +0300	[thread overview]
Message-ID: <20201028100602.168752-2-pgofman@codeweavers.com> (raw)
In-Reply-To: <20201028100602.168752-1-pgofman@codeweavers.com>

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
---
 util_math.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/util_math.h b/util_math.h
index e2fa95f5..f6bbe192 100644
--- a/util_math.h
+++ b/util_math.h
@@ -38,6 +38,9 @@ static inline unsigned log2_int(unsigned x)
     if (x < 2) {
         return 0;
     }
+    if (x & 0x80000000) {
+        return 31;
+    }
     for (l = 2; ; l++) {
         if ((unsigned)(1 << l) > x) {
             return l - 1;
-- 
2.28.0

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  reply	other threads:[~2020-10-28 10:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-28 10:06 [PATCH libdrm 1/2] include: Factor out log2_int() function Paul Gofman
2020-10-28 10:06 ` Paul Gofman [this message]
2020-10-30 11:07   ` [PATCH libdrm 2/2] include: Avoid potentially infinite loop in log2_int() Pekka Paalanen
2020-10-30 13:07     ` Paul Gofman

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