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authorTheodore Ts'o <tytso@mit.edu>2018-06-14 06:00:48 +0300
committerTheodore Ts'o <tytso@mit.edu>2018-06-14 06:00:48 +0300
commit819b23f1c501b17b9694325471789e6b5cc2d0d2 (patch)
tree207be1b910f9777735a6fc92427ed8f95625b4f4 /fs/ext4/balloc.c
parent513f86d73855ce556ea9522b6bfd79f87356dc3a (diff)
downloadlinux-819b23f1c501b17b9694325471789e6b5cc2d0d2.tar.xz
ext4: always check block group bounds in ext4_init_block_bitmap()
Regardless of whether the flex_bg feature is set, we should always check to make sure the bits we are setting in the block bitmap are within the block group bounds. https://bugzilla.kernel.org/show_bug.cgi?id=199865 Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/balloc.c')
-rw-r--r--fs/ext4/balloc.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index b00481c475cb..8a2e202ade8a 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -184,7 +184,6 @@ static int ext4_init_block_bitmap(struct super_block *sb,
unsigned int bit, bit_max;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t start, tmp;
- int flex_bg = 0;
J_ASSERT_BH(bh, buffer_locked(bh));
@@ -207,22 +206,19 @@ static int ext4_init_block_bitmap(struct super_block *sb,
start = ext4_group_first_block_no(sb, block_group);
- if (ext4_has_feature_flex_bg(sb))
- flex_bg = 1;
-
/* Set bits for block and inode bitmaps, and inode table */
tmp = ext4_block_bitmap(sb, gdp);
- if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
+ if (ext4_block_in_group(sb, tmp, block_group))
ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
tmp = ext4_inode_bitmap(sb, gdp);
- if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
+ if (ext4_block_in_group(sb, tmp, block_group))
ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
tmp = ext4_inode_table(sb, gdp);
for (; tmp < ext4_inode_table(sb, gdp) +
sbi->s_itb_per_group; tmp++) {
- if (!flex_bg || ext4_block_in_group(sb, tmp, block_group))
+ if (ext4_block_in_group(sb, tmp, block_group))
ext4_set_bit(EXT4_B2C(sbi, tmp - start), bh->b_data);
}