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ext4: fix potential integer overflow

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Since sizeof(ext_new_group_data) > sizeof(ext_new_flex_group_data),
integer overflow could be happened.
Therefore, need to fix integer overflow sanitization.

Cc: stable@vger.kernel.org
Signed-off-by: Insu Yun <wuninsu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Insu Yun
2016-02-12 01:15:59 -05:00
committed by Theodore Ts'o
parent 802cf1f9f5
commit 46901760b4
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/resize.c
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@@ -198,7 +198,7 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
if (flex_gd == NULL) if (flex_gd == NULL)
goto out3; goto out3;
if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
goto out2; goto out2;
flex_gd->count = flexbg_size; flex_gd->count = flexbg_size;