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[PATCH] more ext3 16T overflow fixes 

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 <esandeen@redhat.com>
Cc: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Sandeen 2006-09-27 01:49:36 -07:00 committed by Linus Torvalds
parent a4e4de36dc
commit 32c2d2bc4b
2 changed files with 23 additions and 6 deletions
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12
fs/ext3/balloc.c
View File

@ -202,7 +202,7 @@ goal_in_my_reservation(struct ext3_reserve_window *rsv, ext3_grpblk_t grp_goal,
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 ext3_reserve_window_node *my_rsv,
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 super_block *sb, handle_t *handle,
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 super_block *sb, handle_t *handle,
* 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 super_block *sb, handle_t *handle,
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();
}

17
fs/ext3/resize.c
View File

@ -731,6 +731,18 @@ int ext3_group_add(struct super_block *sb, struct ext3_new_group_data *input)
return -EPERM;
}
if (le32_to_cpu(es->s_blocks_count) + input->blocks_count <
le32_to_cpu(es->s_blocks_count)) {
ext3_warning(sb, __FUNCTION__, "blocks_count overflow\n");
return -EINVAL;
}
if (le32_to_cpu(es->s_inodes_count) + EXT3_INODES_PER_GROUP(sb) <
le32_to_cpu(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)){
@ -959,6 +971,11 @@ int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
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;