From: Eric Sandeen Some of the changes in balloc.c are just cosmetic, as Andreas pointed out - if they overflow they'll then underflow and things are fine. 5th hunk actually fixes an overflow problem. Also check for potential overflows in inode & block counts when resizing. Signed-off-by: Eric Sandeen Cc: Mingming Cao Signed-off-by: Andrew Morton --- fs/ext3/balloc.c | 12 ++++++------ fs/ext3/resize.c | 15 +++++++++++++++ 2 files changed, 21 insertions(+), 6 deletions(-) diff -puN fs/ext3/balloc.c~more-ext3-16t-overflow-fixes fs/ext3/balloc.c --- a/fs/ext3/balloc.c~more-ext3-16t-overflow-fixes +++ a/fs/ext3/balloc.c @@ -202,7 +202,7 @@ goal_in_my_reservation(struct ext3_reser ext3_fsblk_t group_first_block, group_last_block; group_first_block = ext3_group_first_block_no(sb, group); - group_last_block = group_first_block + EXT3_BLOCKS_PER_GROUP(sb) - 1; + group_last_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); if ((rsv->_rsv_start > group_last_block) || (rsv->_rsv_end < group_first_block)) @@ -1047,7 +1047,7 @@ static int alloc_new_reservation(struct spinlock_t *rsv_lock = &EXT3_SB(sb)->s_rsv_window_lock; group_first_block = ext3_group_first_block_no(sb, group); - group_end_block = group_first_block + EXT3_BLOCKS_PER_GROUP(sb) - 1; + group_end_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); if (grp_goal < 0) start_block = group_first_block; @@ -1239,7 +1239,7 @@ ext3_try_to_allocate_with_rsv(struct sup struct ext3_reserve_window_node * my_rsv, unsigned long *count, int *errp) { - ext3_fsblk_t group_first_block; + ext3_fsblk_t group_first_block, group_last_block; ext3_grpblk_t ret = 0; int fatal; unsigned long num = *count; @@ -1276,6 +1276,7 @@ ext3_try_to_allocate_with_rsv(struct sup * first block is the block number of the first block in this group */ group_first_block = ext3_group_first_block_no(sb, group); + group_last_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1); /* * Basically we will allocate a new block from inode's reservation @@ -1311,9 +1312,8 @@ ext3_try_to_allocate_with_rsv(struct sup try_to_extend_reservation(my_rsv, sb, *count-my_rsv->rsv_end + grp_goal - 1); - if ((my_rsv->rsv_start >= group_first_block + - EXT3_BLOCKS_PER_GROUP(sb)) - || (my_rsv->rsv_end < group_first_block)) { + if ((my_rsv->rsv_start > group_last_block) || + (my_rsv->rsv_end < group_first_block)) { rsv_window_dump(&EXT3_SB(sb)->s_rsv_window_root, 1); BUG(); } diff -puN fs/ext3/resize.c~more-ext3-16t-overflow-fixes fs/ext3/resize.c --- a/fs/ext3/resize.c~more-ext3-16t-overflow-fixes +++ a/fs/ext3/resize.c @@ -730,6 +730,16 @@ int ext3_group_add(struct super_block *s return -EPERM; } + if (es->s_blocks_count + input->blocks_count < es->s_blocks_count) { + ext3_warning(sb, __FUNCTION__, "blocks_count overflow\n"); + return -EINVAL; + } + + if (es->s_inodes_count+EXT3_INODES_PER_GROUP(sb) < es->s_inodes_count) { + ext3_warning(sb, __FUNCTION__, "inodes_count overflow\n"); + return -EINVAL; + } + if (reserved_gdb || gdb_off == 0) { if (!EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_RESIZE_INODE)){ @@ -958,6 +968,11 @@ int ext3_group_extend(struct super_block add = EXT3_BLOCKS_PER_GROUP(sb) - last; + if (o_blocks_count + add < o_blocks_count) { + ext3_warning(sb, __FUNCTION__, "blocks_count overflow"); + return -EINVAL; + } + if (o_blocks_count + add > n_blocks_count) add = n_blocks_count - o_blocks_count; _