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Date: Fri, 22 Nov 2019 01:12:49 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>, "David S . Miller" <davem@...emloft.net>, Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 4.4 56/68] net/core/neighbour: tell kmemleak about hash tables From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> [ Upstream commit 85704cb8dcfd88d351bfc87faaeba1c8214f3177 ] This fixes false-positive kmemleak reports about leaked neighbour entries: unreferenced object 0xffff8885c6e4d0a8 (size 1024): comm "softirq", pid 0, jiffies 4294922664 (age 167640.804s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 20 2c f3 83 ff ff ff ff ........ ,...... 08 c0 ef 5f 84 88 ff ff 01 8c 7d 02 01 00 00 00 ..._......}..... backtrace: [<00000000748509fe>] ip6_finish_output2+0x887/0x1e40 [<0000000036d7a0d8>] ip6_output+0x1ba/0x600 [<0000000027ea7dba>] ip6_send_skb+0x92/0x2f0 [<00000000d6e2111d>] udp_v6_send_skb.isra.24+0x680/0x15e0 [<000000000668a8be>] udpv6_sendmsg+0x18c9/0x27a0 [<000000004bd5fa90>] sock_sendmsg+0xb3/0xf0 [<000000008227b29f>] ___sys_sendmsg+0x745/0x8f0 [<000000008698009d>] __sys_sendmsg+0xde/0x170 [<00000000889dacf1>] do_syscall_64+0x9b/0x400 [<0000000081cdb353>] entry_SYSCALL_64_after_hwframe+0x49/0xbe [<000000005767ed39>] 0xffffffffffffffff Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/core/neighbour.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/net/core/neighbour.c b/net/core/neighbour.c index b3b242f7ecfd2..bba672482a0ef 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -18,6 +18,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/slab.h> +#include <linux/kmemleak.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/module.h> @@ -325,12 +326,14 @@ static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) ret = kmalloc(sizeof(*ret), GFP_ATOMIC); if (!ret) return NULL; - if (size <= PAGE_SIZE) + if (size <= PAGE_SIZE) { buckets = kzalloc(size, GFP_ATOMIC); - else + } else { buckets = (struct neighbour __rcu **) __get_free_pages(GFP_ATOMIC | __GFP_ZERO, get_order(size)); + kmemleak_alloc(buckets, size, 0, GFP_ATOMIC); + } if (!buckets) { kfree(ret); return NULL; @@ -350,10 +353,12 @@ static void neigh_hash_free_rcu(struct rcu_head *head) size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); struct neighbour __rcu **buckets = nht->hash_buckets; - if (size <= PAGE_SIZE) + if (size <= PAGE_SIZE) { kfree(buckets); - else + } else { + kmemleak_free(buckets); free_pages((unsigned long)buckets, get_order(size)); + } kfree(nht); } -- 2.20.1
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