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Commit df5ef7a0 authored by Jerry Lee's avatar Jerry Lee Committed by Greg Kroah-Hartman
Browse files

ext4: fix overflow caused by missing cast in ext4_resize_fs() 



commit aec51758ce10a9c847a62a48a168f8c804c6e053 upstream.

On a 32-bit platform, the value of n_blcoks_count may be wrong during
the file system is resized to size larger than 2^32 blocks.  This may
caused the superblock being corrupted with zero blocks count.

Fixes: 1c6bd717
Signed-off-by: default avatarJerry Lee <jerrylee@qnap.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8a3a235b

fs/ext4/resize.c

+2 −1
Original line number Diff line number Diff line
@@ -1929,7 +1929,8 @@ retry: 
			n_desc_blocks = o_desc_blocks +

				le16_to_cpu(es->s_reserved_gdt_blocks);

			n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);

			n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb);

			n_blocks_count = (ext4_fsblk_t)n_group *

				EXT4_BLOCKS_PER_GROUP(sb);

			n_group--; /* set to last group number */

		}