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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2010-01-12 03:36:14 +0900
committerAl Viro <viro@zeniv.linux.org.uk>2010-01-14 09:05:26 -0500
commit806892e9e12e731a0ca76c8f62ad95cf8eea9614 (patch)
treea063df1524ed862ef2475052e1cc1c66de390dc2 /fs/ecryptfs
parent6d125529c6cbfe570ce3bf9a0728548f087499da (diff)
downloadop-kernel-dev-806892e9e12e731a0ca76c8f62ad95cf8eea9614.zip
op-kernel-dev-806892e9e12e731a0ca76c8f62ad95cf8eea9614.tar.gz
ecryptfs: Fix refcnt leak on ecryptfs_follow_link() error path
If ->follow_link handler return the error, it should decrement nd->path refcnt. But, ecryptfs_follow_link() doesn't decrement. This patch fix it by using usual nd_set_link() style error handling, instead of playing with nd->path. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/inode.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 429ca0b..7f85450 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -715,31 +715,31 @@ static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
/* Released in ecryptfs_put_link(); only release here on error */
buf = kmalloc(len, GFP_KERNEL);
if (!buf) {
- rc = -ENOMEM;
+ buf = ERR_PTR(-ENOMEM);
goto out;
}
old_fs = get_fs();
set_fs(get_ds());
rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
set_fs(old_fs);
- if (rc < 0)
- goto out_free;
- else
+ if (rc < 0) {
+ kfree(buf);
+ buf = ERR_PTR(rc);
+ } else
buf[rc] = '\0';
- rc = 0;
- nd_set_link(nd, buf);
- goto out;
-out_free:
- kfree(buf);
out:
- return ERR_PTR(rc);
+ nd_set_link(nd, buf);
+ return NULL;
}
static void
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
- /* Free the char* */
- kfree(nd_get_link(nd));
+ char *buf = nd_get_link(nd);
+ if (!IS_ERR(buf)) {
+ /* Free the char* */
+ kfree(buf);
+ }
}
/**
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