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fs: ext4: fix "invalid extent block" error 

From U-Boot commit:

| commit b5bbac1a9b07016602559ff483df265fef6c1f83
| Author: Ionut Nicu <ioan.nicu.ext@nsn.com>
| Date:   Mon Jan 13 12:00:08 2014 +0100
|
|     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>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-07-25 10:31:48 +02:00
parent 6414f69910
commit 400b4e2bb3
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/ext4_common.c
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@ -60,7 +60,7 @@ static struct ext4_extent_header *ext4fs_get_extent_block(struct ext2_data *data
i++;
if (i >= le32_to_cpu(ext_block->eh_entries))
break;
} while (fileblock > le32_to_cpu(index[i].ei_block));
} while (fileblock >= le32_to_cpu(index[i].ei_block));
if (--i < 0)
return 0;