* [PATCH] ip_sockglue: Fix missing-check bug in ip_ra_control()
@ 2019-05-24 3:24 Gen Zhang
2019-05-25 18:01 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Gen Zhang @ 2019-05-24 3:24 UTC (permalink / raw)
To: davem, kuznet, yoshfuji, ast, daniel, kafai, songliubraving, yhs
Cc: netdev, linux-kernel, bpf
In function ip_ra_control(), the pointer new_ra is allocated a memory
space via kmalloc(). And it is used in the following codes. However,
when there is a memory allocation error, kmalloc() fails. Thus null
pointer dereference may happen. And it will cause the kernel to crash.
Therefore, we should check the return value and handle the error.
Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
---
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 82f341e..aa3fd61 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -343,6 +343,8 @@ int ip_ra_control(struct sock *sk, unsigned char on,
return -EINVAL;
new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
+ if (on && !new_ra)
+ return -ENOMEM;
mutex_lock(&net->ipv4.ra_mutex);
for (rap = &net->ipv4.ra_chain;
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ip_sockglue: Fix missing-check bug in ip_ra_control()
2019-05-24 3:24 [PATCH] ip_sockglue: Fix missing-check bug in ip_ra_control() Gen Zhang
@ 2019-05-25 18:01 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2019-05-25 18:01 UTC (permalink / raw)
To: blackgod016574
Cc: kuznet, yoshfuji, ast, daniel, kafai, songliubraving, yhs,
netdev, linux-kernel, bpf
From: Gen Zhang <blackgod016574@gmail.com>
Date: Fri, 24 May 2019 11:24:26 +0800
> In function ip_ra_control(), the pointer new_ra is allocated a memory
> space via kmalloc(). And it is used in the following codes. However,
> when there is a memory allocation error, kmalloc() fails. Thus null
> pointer dereference may happen. And it will cause the kernel to crash.
> Therefore, we should check the return value and handle the error.
>
> Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
Applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-05-25 18:01 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-24 3:24 [PATCH] ip_sockglue: Fix missing-check bug in ip_ra_control() Gen Zhang
2019-05-25 18:01 ` David Miller
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).