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Date: Tue, 11 Nov 2008 19:43:04 -0800 From: Valerie Aurora Henson <vaurora@...hat.com> To: linux-ext4@...r.kernel.org Cc: Valerie Aurora Henson <vaurora@...hat.com> Subject: [RFC PATCH 11/17] Fix overflow in calculation of total file system blocks Blocks per group and group desc count are both 32-bit; multiplied they produce a 32-bit quantity which overflowed. Signed-off-by: Valerie Aurora Henson <vaurora@...hat.com> --- lib/ext2fs/bitmaps.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/ext2fs/bitmaps.c b/lib/ext2fs/bitmaps.c index f438a8b..91dc7a1 100644 --- a/lib/ext2fs/bitmaps.c +++ b/lib/ext2fs/bitmaps.c @@ -92,8 +92,8 @@ errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs, start = fs->super->s_first_data_block; end = ext2fs_blocks_count(fs->super)-1; - real_end = (EXT2_BLOCKS_PER_GROUP(fs->super) - * fs->group_desc_count)-1 + start; + real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super) + * (__u64) fs->group_desc_count)-1 + start; if (fs->flags & EXT2_FLAG_NEW_BITMAPS) return (ext2fs_alloc_generic_bmap(fs, -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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