[PATCH 1/4] ext4: unify the type of flexbg_size to unsigned int

From: Baokun Li
Date: Wed Oct 18 2023 - 07:37:48 EST


The maximum value of flexbg_size is 2^31, but the maximum value of int
is (2^31 - 1), so overflow may occur when the type of flexbg_size is
declared as int.

For example, when uninit_mask is initialized in ext4_alloc_group_tables(),
if flexbg_size == 2^31, the initialized uninit_mask is incorrect, and this
may causes set_flexbg_block_bitmap() to trigger a BUG_ON().

Therefore, the flexbg_size type is declared as unsigned int to avoid
overflow and memory waste.

Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
---
fs/ext4/resize.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 4fe061edefdd..c6d4539d4c1f 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -228,7 +228,7 @@ struct ext4_new_flex_group_data {
*
* Returns NULL on failure otherwise address of the allocated structure.
*/
-static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
+static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned int flexbg_size)
{
struct ext4_new_flex_group_data *flex_gd;

@@ -283,7 +283,7 @@ static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
*/
static int ext4_alloc_group_tables(struct super_block *sb,
struct ext4_new_flex_group_data *flex_gd,
- int flexbg_size)
+ unsigned int flexbg_size)
{
struct ext4_new_group_data *group_data = flex_gd->groups;
ext4_fsblk_t start_blk;
@@ -384,12 +384,12 @@ static int ext4_alloc_group_tables(struct super_block *sb,
group = group_data[0].group;

printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
- "%d groups, flexbg size is %d:\n", flex_gd->count,
+ "%u groups, flexbg size is %u:\n", flex_gd->count,
flexbg_size);

for (i = 0; i < flex_gd->count; i++) {
ext4_debug(
- "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n",
+ "adding %s group %u: %u blocks (%u free, %u mdata blocks)\n",
ext4_bg_has_super(sb, group + i) ? "normal" :
"no-super", group + i,
group_data[i].blocks_count,
@@ -1606,7 +1606,7 @@ static int ext4_flex_group_add(struct super_block *sb,
static int ext4_setup_next_flex_gd(struct super_block *sb,
struct ext4_new_flex_group_data *flex_gd,
ext4_fsblk_t n_blocks_count,
- unsigned long flexbg_size)
+ unsigned int flexbg_size)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
@@ -1990,8 +1990,9 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
ext4_fsblk_t o_blocks_count;
ext4_fsblk_t n_blocks_count_retry = 0;
unsigned long last_update_time = 0;
- int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
+ int err = 0;
int meta_bg;
+ unsigned int flexbg_size = ext4_flex_bg_size(sbi);

/* See if the device is actually as big as what was requested */
bh = ext4_sb_bread(sb, n_blocks_count - 1, 0);
--
2.31.1