linux-ext4 - [PATCH 1/1] Fix Ubsan error

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Message-ID: <CAA=40849KSFkpG3kkppAruwxfqtQwTw0KsV-LXR5wODdspxDWw@mail.gmail.com>
Date:	Wed, 30 Mar 2016 22:29:55 +0530
From:	"Navin P.S" <navinp1912@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH 1/1] Fix Ubsan error

Hi,
  This fixes bugs 114701 and 112161 at bugzilla.kernel.org
  It is caused due to left shift by a negative value which is undefined.
  Since these values are not used after a negative shift the change
  introduces a break.

Signed-off-by: Navin P.S <navinp1912@...il.com>
---
 fs/ext4/mballoc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 50e05df..8ccfcf7 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1278,6 +1278,8 @@ static int mb_find_order_for_block(struct
ext4_buddy *e4b, int block)
  /* this block is part of buddy of order 'order' */
  return order;
  }
+ if (order > e4b->bd_blkbits)
+ break;
  bb += 1 << (e4b->bd_blkbits - order);
  order++;
  }
@@ -2616,6 +2618,8 @@ int ext4_mb_init(struct super_block *sb)
  do {
  sbi->s_mb_offsets[i] = offset;
  sbi->s_mb_maxs[i] = max;
+ if (i > sb->s_blocksize_bits)
+ break;
  offset += 1 << (sb->s_blocksize_bits - i);
  max = max >> 1;
  i++;
-- 
2.5.0
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