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net/ipv4: Revert use of struct_size() helper

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Revert the use of structr_size() and stay with IP_MSFILTER_SIZE() for
now, as in this case, the size of struct ip_msfilter didn't change with
the addition of the flexible array imsf_slist_flex[]. So, if we use
struct_size() we will be allocating and calculating the size of
struct ip_msfilter with one too many items for imsf_slist_flex[].

We might use struct_size() in the future, but for now let's stay
with IP_MSFILTER_SIZE().

Fixes: 	2d3e5caf96 ("net/ipv4: Replace one-element array with flexible-array member")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2021-08-04 13:23:25 -05:00 committed by David S. Miller
parent af352460b4
commit 4167a96057
2 changed files with 7 additions and 9 deletions
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4
net/ipv4/igmp.c
View file

@ -2553,8 +2553,8 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
len = flex_array_size(psl, sl_addr, copycount);
msf->imsf_numsrc = count;
if (put_user(struct_size(optval, imsf_slist_flex, copycount), optlen) ||
copy_to_user(optval, msf, struct_size(optval, imsf_slist_flex, 0))) {
if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
return -EFAULT;
}
if (len &&

12
net/ipv4/ip_sockglue.c
View file

@ -667,7 +667,7 @@ static int set_mcast_msfilter(struct sock *sk, int ifindex,
struct sockaddr_in *psin;
int err, i;
msf = kmalloc(struct_size(msf, imsf_slist_flex, numsrc), GFP_KERNEL);
msf = kmalloc(IP_MSFILTER_SIZE(numsrc), GFP_KERNEL);
if (!msf)
return -ENOBUFS;
@ -1228,7 +1228,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
{
struct ip_msfilter *msf;
if (optlen < struct_size(msf, imsf_slist_flex, 0))
if (optlen < IP_MSFILTER_SIZE(0))
goto e_inval;
if (optlen > sysctl_optmem_max) {
err = -ENOBUFS;
@ -1246,8 +1246,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
err = -ENOBUFS;
break;
}
if (struct_size(msf, imsf_slist_flex, msf->imsf_numsrc) >
optlen) {
if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
kfree(msf);
err = -EINVAL;
break;
@ -1660,12 +1659,11 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
{
struct ip_msfilter msf;
if (len < struct_size(&msf, imsf_slist_flex, 0)) {
if (len < IP_MSFILTER_SIZE(0)) {
err = -EINVAL;
goto out;
}
if (copy_from_user(&msf, optval,
struct_size(&msf, imsf_slist_flex, 0))) {
if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
err = -EFAULT;
goto out;
}