This is a note to let you know that I've just added the patch titled netfilter: ipset: Fix oversized kvmalloc() calls to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: netfilter-ipset-fix-oversized-kvmalloc-calls.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7bbc3d385bd813077acaf0e6fdb2a86a901f5382 Mon Sep 17 00:00:00 2001 From: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxx> Date: Mon, 6 Sep 2021 18:26:34 +0200 Subject: netfilter: ipset: Fix oversized kvmalloc() calls From: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxx> commit 7bbc3d385bd813077acaf0e6fdb2a86a901f5382 upstream. The commit commit 7661809d493b426e979f39ab512e3adf41fbcc69 Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx Reported-by: syzbot+2b8443c35458a617c904@xxxxxxxxxxxxxxxxxxxxxxxxx Reported-by: syzbot+ee5cb15f4a0e85e0d54e@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/netfilter/ipset/ip_set_hash_gen.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/netfilter/ipset/ip_set_hash_gen.h +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -104,11 +104,11 @@ 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; Patches currently in stable-queue which might be from kadlec@xxxxxxxxxxxxx are queue-4.19/netfilter-ipset-fix-oversized-kvmalloc-calls.patch