From a11b544b4a4d4895224671c6b59556666e0a7512 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Tue, 8 Aug 2023 01:39:08 +0200
Subject: ext2fs: Fix shift in find_next_zero_bit

Shifting unsigned 32bit right by 32 bits is undefined, so avoid this.
---
 ext2fs/bitmap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext2fs/bitmap.c b/ext2fs/bitmap.c
index c440c8b1..cf7702d7 100644
--- a/ext2fs/bitmap.c
+++ b/ext2fs/bitmap.c
@@ -70,7 +70,8 @@ find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
   if (offset)
     {
       tmp = *(p++);
-      tmp |= ~0UL >> (32-offset);
+      if (offset)
+	tmp |= ~0UL >> (32-offset);
       if (size < 32)
 	goto found_first;
       if (~tmp)
-- 
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