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infra: safeguard dent parent pointer

This commit is contained in:
Thomas Schoebel-Theuer 2020-09-12 22:29:40 +02:00
parent 423ff91956
commit 85b8b1312f
1 changed files with 11 additions and 8 deletions
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19
kernel/sy_old/sy_generic.c
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@ -1116,11 +1116,13 @@ void bind_to_dent(struct mars_dent *dent, struct say_channel **ch)
// Memoize the channel. This is executed only once for each dent.
if (unlikely(!dent->d_say_channel)) {
struct mars_dent *test = dent->d_parent;
for (;;) {
if (!test) {
dent->d_say_channel = default_channel;
break;
}
CHECK_PTR(test, fatal);
if (test->d_use_channel && test->d_path) {
dent->d_say_channel = make_channel(test->d_path,
true);
@ -1136,6 +1138,7 @@ void bind_to_dent(struct mars_dent *dent, struct say_channel **ch)
if (*ch)
bind_to_channel(*ch, current);
}
fatal: ;
}
EXPORT_SYMBOL_GPL(bind_to_dent);
@ -1576,20 +1579,20 @@ int mars_filler(void *__buf, const char *name, int namlen, loff_t offset,
}
static
void _reconnect_dent(struct mars_cookie *cookie, struct mars_dent *dent)
void _reconnect_dent(struct mars_dent *parent, struct mars_dent *dent)
{
CHECK_PTR(dent, fatal);
if (dent->d_parent == cookie->parent)
if (dent->d_parent == parent)
return;
if (dent->d_parent) {
CHECK_PTR(dent->d_parent, fatal);
dent->d_parent->d_child_count--;
}
dent->d_parent = cookie->parent;
if (dent->d_parent) {
CHECK_PTR(cookie->parent, fatal);
dent->d_parent->d_child_count++;
dent->d_parent = parent;
if (parent) {
CHECK_PTR(parent, fatal);
parent->d_child_count++;
}
fatal: ;
}
@ -1738,7 +1741,7 @@ void _mars_order(struct mars_cookie *cookie, struct mars_dent *dent)
list_add(&dent->dent_hash_link, hash_prev);
found:
_reconnect_dent(cookie, dent);
_reconnect_dent(cookie->parent, dent);
fatal: ;
}
@ -1790,7 +1793,7 @@ void _mars_order_all(struct mars_cookie *cookie)
list_add(&dent->dent_link, &later_anchor);
else
list_add_tail(&dent->dent_link, &later_anchor);
_reconnect_dent(cookie, dent);
_reconnect_dent(NULL, dent);
continue;
}
if (!cookie->some_ordered) {