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net: ipv4: remove erroneous advancement of list pointer
Causes crash when lifetime expires on an adress as garbage is
dereferenced soon after.
This used to look like this:
for (ifap = &ifa->ifa_dev->ifa_list;
*ifap != NULL; ifap = &(*ifap)->ifa_next) {
if (*ifap == ifa) ...
but this was changed to:
struct in_ifaddr *tmp;
ifap = &ifa->ifa_dev->ifa_list;
tmp = rtnl_dereference(*ifap);
while (tmp) {
tmp = rtnl_dereference(tmp->ifa_next); // Bogus
if (rtnl_dereference(*ifap) == ifa) {
...
ifap = &tmp->ifa_next; // Can be NULL
tmp = rtnl_dereference(*ifap); // Dereference
}
}
Remove the bogus assigment/list entry skip.
Fixes: 2638eb8b50
("net: ipv4: provide __rcu annotation for ifa_list")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
78fe8a28fb
commit
40008e9211
1 changed files with 1 additions and 2 deletions
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@ -745,8 +745,7 @@ static void check_lifetime(struct work_struct *work)
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ifap = &ifa->ifa_dev->ifa_list;
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tmp = rtnl_dereference(*ifap);
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while (tmp) {
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tmp = rtnl_dereference(tmp->ifa_next);
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if (rtnl_dereference(*ifap) == ifa) {
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if (tmp == ifa) {
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inet_del_ifa(ifa->ifa_dev,
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ifap, 1);
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break;
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