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-rw-r--r--net/compat.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/net/compat.c b/net/compat.c
index 01bf95d0832e..8146f654391c 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -548,6 +548,9 @@ struct compat_group_filter {
__attribute__ ((aligned(4)));
} __attribute__ ((packed));
+#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
+ sizeof(struct __kernel_sockaddr_storage))
+
int compat_mc_setsockopt(struct sock *sock, int level, int optname,
char __user *optval, int optlen,
@@ -582,7 +585,7 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname,
case MCAST_UNBLOCK_SOURCE:
{
struct compat_group_source_req __user *gsr32 = (void *)optval;
- struct group_source_req *kgsr = compat_alloc_user_space(
+ struct group_source_req __user *kgsr = compat_alloc_user_space(
sizeof(struct group_source_req));
u32 interface;
@@ -603,10 +606,10 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname,
case MCAST_MSFILTER:
{
struct compat_group_filter __user *gf32 = (void *)optval;
- struct group_filter *kgf;
+ struct group_filter __user *kgf;
u32 interface, fmode, numsrc;
- if (!access_ok(VERIFY_READ, gf32, sizeof(*gf32)) ||
+ if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
__get_user(interface, &gf32->gf_interface) ||
__get_user(fmode, &gf32->gf_fmode) ||
__get_user(numsrc, &gf32->gf_numsrc))
@@ -622,7 +625,7 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname,
__put_user(numsrc, &kgf->gf_numsrc) ||
copy_in_user(&kgf->gf_group, &gf32->gf_group,
sizeof(kgf->gf_group)) ||
- (numsrc && copy_in_user(&kgf->gf_slist, &gf32->gf_slist,
+ (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
numsrc * sizeof(kgf->gf_slist[0]))))
return -EFAULT;
koptval = (char __user *)kgf;

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