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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

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* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: check block device size on mount
  ext4: Fix off-by-one-error in ext4_valid_extent_idx()
  ext4: Fix big-endian problem in __ext4_check_blockref()
This commit is contained in:
Linus Torvalds 2009-04-09 16:42:05 -07:00
commit 54f93b74cf
3 changed files with 14 additions and 5 deletions
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2
fs/ext4/extents.c
View file

@ -342,7 +342,7 @@ static int ext4_valid_extent_idx(struct inode *inode,
ext4_fsblk_t block = idx_pblock(ext_idx); ext4_fsblk_t block = idx_pblock(ext_idx);
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
if (unlikely(block < le32_to_cpu(es->s_first_data_block) || if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
(block > ext4_blocks_count(es)))) (block >= ext4_blocks_count(es))))
return 0; return 0;
else else
return 1; return 1;

8
fs/ext4/inode.c
View file

@ -372,16 +372,16 @@ static int ext4_block_to_path(struct inode *inode,
} }
static int __ext4_check_blockref(const char *function, struct inode *inode, static int __ext4_check_blockref(const char *function, struct inode *inode,
unsigned int *p, unsigned int max) { __le32 *p, unsigned int max) {
unsigned int maxblocks = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es); unsigned int maxblocks = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es);
unsigned int *bref = p; __le32 *bref = p;
while (bref < p+max) { while (bref < p+max) {
if (unlikely(*bref >= maxblocks)) { if (unlikely(le32_to_cpu(*bref) >= maxblocks)) {
ext4_error(inode->i_sb, function, ext4_error(inode->i_sb, function,
"block reference %u >= max (%u) " "block reference %u >= max (%u) "
"in inode #%lu, offset=%d", "in inode #%lu, offset=%d",
*bref, maxblocks, le32_to_cpu(*bref), maxblocks,
inode->i_ino, (int)(bref-p)); inode->i_ino, (int)(bref-p));
return -EIO; return -EIO;
} }

9
fs/ext4/super.c
View file

@ -2508,6 +2508,15 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
if (EXT4_BLOCKS_PER_GROUP(sb) == 0) if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
goto cantfind_ext4; goto cantfind_ext4;
/* check blocks count against device size */
blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
if (blocks_count && ext4_blocks_count(es) > blocks_count) {
printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu "
"exceeds size of device (%llu blocks)\n",
ext4_blocks_count(es), blocks_count);
goto failed_mount;
}
/* /*
* It makes no sense for the first data block to be beyond the end * It makes no sense for the first data block to be beyond the end
* of the filesystem. * of the filesystem.