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ext4fs: fix "invalid extent block" error 

For files where we actually have extent indexes following
an extent header (ext_block->eh_depth != 0), the do/while
loop from ext4fs_get_extent_block() does not select the
proper extent index structure.

For example, if we have:

ext_block->eh_depth = 1
ext_block->eh_entries = 1
fileblock = 0
index[0].ei_block = 0

the do/while loop will exit with i set to 0 and the
ext4fs_get_extent_block() function will return 0, even if
there was a valid extent index structure following the
header.

Signed-off-by: Ionut Nicu <ioan.nicu.ext@nsn.com>
Signed-off-by: Mathias Rulf <mathias.rulf@nsn.com>
This commit is contained in:
Ionut Nicu 2014-01-13 12:00:08 +01:00 committed by Tom Rini
parent 470173274d
commit b5bbac1a9b
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/ext4_common.c
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@ -1430,7 +1430,7 @@ static struct ext4_extent_header *ext4fs_get_extent_block
i++; i++;
if (i >= le16_to_cpu(ext_block->eh_entries)) if (i >= le16_to_cpu(ext_block->eh_entries))
break; break;
} while (fileblock > le32_to_cpu(index[i].ei_block)); } while (fileblock >= le32_to_cpu(index[i].ei_block));
if (--i < 0) if (--i < 0)
return 0; return 0;