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btrfs-progs: convert: Prevent accounting blocks beyond end of device

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When looping across data block bitmap, __ext2_add_one_block() may add
blocks which do not exist on the underlying disk. This commit prevents
this from happening by checking the block index against the maximum
block count that was present in the ext4 filesystem instance that is
being converted.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Chandan Rajendra 2016-12-08 19:26:19 +05:30 committed by David Sterba
parent 281e476b4d
commit 8583b61309
1 changed files with 3 additions and 0 deletions
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3
convert/main.c
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@ -1525,6 +1525,9 @@ static int __ext2_add_one_block(ext2_filsys fs, char *bitmap,
offset /= EXT2FS_CLUSTER_RATIO(fs);
offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super);
for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) {
if ((i + offset) >= ext2fs_blocks_count(fs->super))
break;
if (ext2fs_test_bit(i, bitmap)) {
u64 start;