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authorTadeusz Struk <tadeusz.struk@linaro.org>2021-12-08 10:27:42 -0800
committerJakub Kicinski <kuba@kernel.org>2021-12-09 07:50:23 -0800
commitfd79a0cbf0b2e34bcc45b13acf962e2032a82203 (patch)
tree08a2129d1ac68d45ff9179dc4f44acb3d584018b
parent158390e45612ef0fde160af0826f1740c36daf21 (diff)
nfc: fix segfault in nfc_genl_dump_devices_done
When kmalloc in nfc_genl_dump_devices() fails then nfc_genl_dump_devices_done() segfaults as below KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted 5.16.0-rc4-01180-g2a987e65025e-dirty #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-6.fc35 04/01/2014 Workqueue: events netlink_sock_destruct_work RIP: 0010:klist_iter_exit+0x26/0x80 Call Trace: <TASK> class_dev_iter_exit+0x15/0x20 nfc_genl_dump_devices_done+0x3b/0x50 genl_lock_done+0x84/0xd0 netlink_sock_destruct+0x8f/0x270 __sk_destruct+0x64/0x3b0 sk_destruct+0xa8/0xd0 __sk_free+0x2e8/0x3d0 sk_free+0x51/0x90 netlink_sock_destruct_work+0x1c/0x20 process_one_work+0x411/0x710 worker_thread+0x6fd/0xa80 Link: https://syzkaller.appspot.com/bug?id=fc0fa5a53db9edd261d56e74325419faf18bd0df Reported-by: syzbot+f9f76f4a0766420b4a02@syzkaller.appspotmail.com Signed-off-by: Tadeusz Struk <tadeusz.struk@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211208182742.340542-1-tadeusz.struk@linaro.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--net/nfc/netlink.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 334f63c9529e..0b4fae183a4b 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -636,8 +636,10 @@ static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
{
struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
- nfc_device_iter_exit(iter);
- kfree(iter);
+ if (iter) {
+ nfc_device_iter_exit(iter);
+ kfree(iter);
+ }
return 0;
}