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| author | Gen Zhang <blackgod016574@gmail.com> | 2019-05-24 11:24:26 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-25 11:00:50 -0700 |
| commit | 425aa0e1d01513437668fa3d4a971168bbaa8515 (patch) | |
| tree | 40b79f75cb767fd303bb8314c1b067192e72d344 /net/ipv4 | |
| parent | 95baa60a0da80a0143e3ddd4d3725758b4513825 (diff) | |
| download | linux-425aa0e1d01513437668fa3d4a971168bbaa8515.tar.gz linux-425aa0e1d01513437668fa3d4a971168bbaa8515.tar.bz2 linux-425aa0e1d01513437668fa3d4a971168bbaa8515.zip | |
ip_sockglue: Fix missing-check bug in ip_ra_control()
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 82f341e84fae..aa3fd61818c4 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; |