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xt_geoip: check for allocation overflow

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This commit is contained in:
Jan Engelhardt
2017-06-26 22:02:35 +02:00
parent a587f9526d
commit c839e87bbb
1 changed files with 2 additions and 1 deletions
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3
extensions/xt_geoip.c
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@@ -75,7 +75,8 @@ geoip_add_node(const struct geoip_country_user __user *umem_ptr,
if (copy_from_user(&umem, umem_ptr, sizeof(umem)) != 0) if (copy_from_user(&umem, umem_ptr, sizeof(umem)) != 0)
return ERR_PTR(-EFAULT); return ERR_PTR(-EFAULT);
if (umem.count > SIZE_MAX / geoproto_size[proto])
return ERR_PTR(-E2BIG);
p = kmalloc(sizeof(struct geoip_country_kernel), GFP_KERNEL); p = kmalloc(sizeof(struct geoip_country_kernel), GFP_KERNEL);
if (p == NULL) if (p == NULL)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);