diff options
| -rw-r--r-- | fs/ext4/super.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 689c02df1af4..2d8a49d74f56 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3195,10 +3195,15 @@ static int count_overhead(struct super_block *sb, ext4_group_t grp, ext4_set_bit(s++, buf); count++; } - for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { - ext4_set_bit(EXT4_B2C(sbi, s++), buf); - count++; + j = ext4_bg_num_gdb(sb, grp); + if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) { + ext4_error(sb, "Invalid number of block group " + "descriptor blocks: %d", j); + j = EXT4_BLOCKS_PER_GROUP(sb) - s; } + count += j; + for (; j > 0; j--) + ext4_set_bit(EXT4_B2C(sbi, s++), buf); } if (!count) return 0; |