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Commit 600d41f4 authored by Insu Yun's avatar Insu Yun Committed by Greg Kroah-Hartman
Browse files

ext4: fix potential integer overflow 



commit 46901760b46064964b41015d00c140c83aa05bcf upstream.

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

Signed-off-by: default avatarInsu Yun <wuninsu@gmail.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 33f48f8a

fs/ext4/resize.c

+1 −1
Original line number Diff line number Diff line
@@ -198,7 +198,7 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) 
	if (flex_gd == NULL)

		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;

	flex_gd->count = flexbg_size;