From: Jerry Lee Date: Sun, 6 Aug 2017 05:18:31 +0000 (-0400) Subject: ext4: fix overflow caused by missing cast in ext4_resize_fs() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c39dcbde3872cb39e1dbff940c610963aad96518;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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: 1c6bd7173d66 Signed-off-by: Jerry Lee Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org # 3.7+ Signed-off-by: Willy Tarreau --- diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index cf0a70486618..f6190fdfd8ce 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1911,7 +1911,8 @@ 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 */ }