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authorPeter Oskolkov <posk@google.com>2018-12-24 12:57:17 -0800
committerDavid S. Miller <davem@davemloft.net>2018-12-24 15:27:56 -0800
commitc92c81df93df95dafbf6926613ce0b436227b007 (patch)
treece78a0a0ef1f8601e4c819a77c214cc9bea381c7 /net/ipv4/inet_hashtables.c
parentdrivers/net: appletalk/cops: remove redundant if statement and mask (diff)
downloadlinux-dev-c92c81df93df95dafbf6926613ce0b436227b007.tar.xz
linux-dev-c92c81df93df95dafbf6926613ce0b436227b007.zip
net: dccp: fix kernel crash on module load
Patch eedbbb0d98b2 "net: dccp: initialize (addr,port) ..." added calling to inet_hashinfo2_init() from dccp_init(). However, inet_hashinfo2_init() is marked as __init(), and thus the kernel panics when dccp is loaded as module. Removing __init() tag from inet_hashinfo2_init() is not feasible because it calls into __init functions in mm. This patch adds inet_hashinfo2_init_mod() function that can be called after the init phase is done; changes dccp_init() to call the new function; un-marks inet_hashinfo2_init() as exported. Fixes: eedbbb0d98b2 ("net: dccp: initialize (addr,port) ...") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/inet_hashtables.c34
1 files changed, 26 insertions, 8 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 2445614de6a7..942265d65eb3 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -762,13 +762,22 @@ void inet_hashinfo_init(struct inet_hashinfo *h)
}
EXPORT_SYMBOL_GPL(inet_hashinfo_init);
+static void init_hashinfo_lhash2(struct inet_hashinfo *h)
+{
+ int i;
+
+ for (i = 0; i <= h->lhash2_mask; i++) {
+ spin_lock_init(&h->lhash2[i].lock);
+ INIT_HLIST_HEAD(&h->lhash2[i].head);
+ h->lhash2[i].count = 0;
+ }
+}
+
void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
unsigned long numentries, int scale,
unsigned long low_limit,
unsigned long high_limit)
{
- unsigned int i;
-
h->lhash2 = alloc_large_system_hash(name,
sizeof(*h->lhash2),
numentries,
@@ -778,14 +787,23 @@ void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
&h->lhash2_mask,
low_limit,
high_limit);
+ init_hashinfo_lhash2(h);
+}
- for (i = 0; i <= h->lhash2_mask; i++) {
- spin_lock_init(&h->lhash2[i].lock);
- INIT_HLIST_HEAD(&h->lhash2[i].head);
- h->lhash2[i].count = 0;
- }
+int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
+{
+ h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
+ if (!h->lhash2)
+ return -ENOMEM;
+
+ h->lhash2_mask = INET_LHTABLE_SIZE - 1;
+ /* INET_LHTABLE_SIZE must be a power of 2 */
+ BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
+
+ init_hashinfo_lhash2(h);
+ return 0;
}
-EXPORT_SYMBOL_GPL(inet_hashinfo2_init);
+EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
{