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xfs: fix potential memory leak in mount option parsing 

When specifying string type mount option (e.g., logdev)
several times in a mount, current option parsing may
cause memory leak. Hence, call kfree for previous one
in this case.

Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Chengguang Xu 2018-02-25 12:17:31 -08:00 committed by Darrick J. Wong
parent b31c2bdcd8
commit 5b4c845ea4
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/xfs_super.c
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@ -250,6 +250,7 @@ xfs_parseargs(
return -EINVAL;
break;
case Opt_logdev:
kfree(mp->m_logname);
mp->m_logname = match_strdup(args);
if (!mp->m_logname)
return -ENOMEM;
@ -258,6 +259,7 @@ xfs_parseargs(
xfs_warn(mp, "%s option not allowed on this system", p);
return -EINVAL;
case Opt_rtdev:
kfree(mp->m_rtname);
mp->m_rtname = match_strdup(args);
if (!mp->m_rtname)
return -ENOMEM;