I built a test kernel with the two commits posted in comment #3. The test kernel can be downloaded from: http://kernel.ubuntu.com/~jsalisbury/lp1800639
Can you test this kernel and see if it resolves this bug? Note about installing test kernels: • If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages. • If the test kernel is 4.15(Bionic) or newer, you need to install the linux-modules, linux-modules-extra and linux-image-unsigned .deb packages. Thanks in advance! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1800639 Title: [Ubuntu] net/af_iucv: fix skb leaks for HiperTransport Status in Ubuntu on IBM z Systems: In Progress Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: Description: net/af_iucv: fix skb leaks for HiperTransport Symptom: Memory leaks and/or double-freed network packets. Problem: Inbound packets may have any combination of flag bits set in their iucv header. Current code only handles certain combinations, and ignores (ie. leaks) all packets with other flags. On Transmit, current code is inconsistent about whether the error paths need to free the skb. Depending on which error path is taken, it may either get freed twice, or leak. Solution: On receive, drop any skb with an unexpected combination of iucv Header flags. On transmit, be consistent in all error paths about free'ing the skb. kerne 4.19 Upstream-ID: 222440996d6daf635bed6cb35041be22ede3e8a0 b2f543949acd1ba64313fdad9e672ef47550d773 Should also be applied, to all other Ubuntu Releases in the field ! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1800639/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
