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security_d_instantiate(): move to the point prior to attaching dentry to inode

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-11 00:53:26 -04:00
parent 84695ffee7
commit b96809173e
1 changed files with 7 additions and 8 deletions
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15
fs/dcache.c
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@ -1775,11 +1775,11 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
{ {
BUG_ON(!hlist_unhashed(&entry->d_u.d_alias)); BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
if (inode) { if (inode) {
security_d_instantiate(entry, inode);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
__d_instantiate(entry, inode); __d_instantiate(entry, inode);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
} }
security_d_instantiate(entry, inode);
} }
EXPORT_SYMBOL(d_instantiate); EXPORT_SYMBOL(d_instantiate);
@ -1796,6 +1796,7 @@ int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
{ {
BUG_ON(!hlist_unhashed(&entry->d_u.d_alias)); BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
security_d_instantiate(entry, inode);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) { if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) {
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
@ -1804,7 +1805,6 @@ int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
} }
__d_instantiate(entry, inode); __d_instantiate(entry, inode);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
security_d_instantiate(entry, inode);
return 0; return 0;
} }
@ -1878,6 +1878,7 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
goto out_iput; goto out_iput;
} }
security_d_instantiate(tmp, inode);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
res = __d_find_any_alias(inode); res = __d_find_any_alias(inode);
if (res) { if (res) {
@ -1900,13 +1901,10 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
hlist_bl_unlock(&tmp->d_sb->s_anon); hlist_bl_unlock(&tmp->d_sb->s_anon);
spin_unlock(&tmp->d_lock); spin_unlock(&tmp->d_lock);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
security_d_instantiate(tmp, inode);
return tmp; return tmp;
out_iput: out_iput:
if (res && !IS_ERR(res))
security_d_instantiate(res, inode);
iput(inode); iput(inode);
return res; return res;
} }
@ -2372,7 +2370,6 @@ static inline void __d_add(struct dentry *dentry, struct inode *inode)
__d_instantiate(dentry, inode); __d_instantiate(dentry, inode);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
} }
security_d_instantiate(dentry, inode);
d_rehash(dentry); d_rehash(dentry);
} }
@ -2387,8 +2384,10 @@ static inline void __d_add(struct dentry *dentry, struct inode *inode)
void d_add(struct dentry *entry, struct inode *inode) void d_add(struct dentry *entry, struct inode *inode)
{ {
if (inode) if (inode) {
security_d_instantiate(entry, inode);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
}
__d_add(entry, inode); __d_add(entry, inode);
} }
EXPORT_SYMBOL(d_add); EXPORT_SYMBOL(d_add);
@ -2782,6 +2781,7 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
if (!inode) if (!inode)
goto out; goto out;
security_d_instantiate(dentry, inode);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
if (S_ISDIR(inode->i_mode)) { if (S_ISDIR(inode->i_mode)) {
struct dentry *new = __d_find_any_alias(inode); struct dentry *new = __d_find_any_alias(inode);
@ -2809,7 +2809,6 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
} else { } else {
__d_move(new, dentry, false); __d_move(new, dentry, false);
write_sequnlock(&rename_lock); write_sequnlock(&rename_lock);
security_d_instantiate(new, inode);
} }
iput(inode); iput(inode);
return new; return new;