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netfilter: ipset: Fix oversized kvmalloc() calls 

commit 7bbc3d385bd813077acaf0e6fdb2a86a901f5382 upstream.

The commit

commit 7661809d493b426e979f39ab512e3adf41fbcc69
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed Jul 14 09:45:49 2021 -0700

    mm: don't allow oversized kvmalloc() calls

limits the max allocatable memory via kvmalloc() to MAX_INT. Apply the
same limit in ipset.

Reported-by: syzbot+3493b1873fb3ea827986@syzkaller.appspotmail.com
Reported-by: syzbot+2b8443c35458a617c904@syzkaller.appspotmail.com
Reported-by: syzbot+ee5cb15f4a0e85e0d54e@syzkaller.appspotmail.com
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jozsef Kadlecsik 2021-09-06 18:26:34 +02:00 committed by Greg Kroah-Hartman
parent fe9bb925e7
commit 6f2f68640b
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/ipset/ip_set_hash_gen.h
View File

@ -132,11 +132,11 @@ htable_size(u8 hbits)
{
size_t hsize;
/* We must fit both into u32 in jhash and size_t */
/* We must fit both into u32 in jhash and INT_MAX in kvmalloc_node() */
if (hbits > 31)
return 0;
hsize = jhash_size(hbits);
if ((((size_t)-1) - sizeof(struct htable)) / sizeof(struct hbucket *)
if ((INT_MAX - sizeof(struct htable)) / sizeof(struct hbucket *)
< hsize)
return 0;