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net, ipv6: convert ipv6_txoptions.refcnt from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Reshetova, Elena 2017-07-04 09:34:54 +03:00 • committed by David S. Miller
commit 0aeea21ada
3 changed files with 7 additions and 6 deletions
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4
net/ipv6/exthdrs.c
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@ -971,7 +971,7 @@ ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt)
*((char **)&opt2->dst1opt) += dif;
if (opt2->srcrt)
*((char **)&opt2->srcrt) += dif;
atomic_set(&opt2->refcnt, 1);
refcount_set(&opt2->refcnt, 1);
}
return opt2;
}
@ -1056,7 +1056,7 @@ ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
return ERR_PTR(-ENOBUFS);
memset(opt2, 0, tot_len);
atomic_set(&opt2->refcnt, 1);
refcount_set(&opt2->refcnt, 1);
opt2->tot_len = tot_len;
p = (char *)(opt2 + 1);

2
net/ipv6/ipv6_sockglue.c
View file

@ -505,7 +505,7 @@ sticky_done:
break;
memset(opt, 0, sizeof(*opt));
atomic_set(&opt->refcnt, 1);
refcount_set(&opt->refcnt, 1);
opt->tot_len = sizeof(*opt) + optlen;
retv = -EFAULT;
if (copy_from_user(opt+1, optval, optlen))