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quota: Improve checking of quota file header

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When we are asked for vfsv0 quota format and the file is in vfsv1
format (or vice versa), refuse to use the quota file. Also return
with error when we don't like the header of quota file.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2009-12-21 21:57:04 +01:00
parent 765f836190
commit 869835dfad
1 changed files with 4 additions and 1 deletions
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5
fs/quota/quota_v2.c
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@ -97,8 +97,11 @@ static int v2_read_file_info(struct super_block *sb, int type)
unsigned int version;
if (!v2_read_header(sb, type, &dqhead))
return 0;
return -1;
version = le32_to_cpu(dqhead.dqh_version);
if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
return -1;
size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);