CVE-2024-49982

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> aoe: fix the potential use-after-free problem in more places<br /> <br /> For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential<br /> use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put()<br /> instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs<br /> into use-after-free.<br /> <br /> Then Nicolai Stange found more places in aoe have potential use-after-free<br /> problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe()<br /> and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push<br /> packet to tx queue. So they should also use dev_hold() to increase the<br /> refcnt of skb-&gt;dev.<br /> <br /> On the other hand, moving dev_put() to tx() causes that the refcnt of<br /> skb-&gt;dev be reduced to a negative value, because corresponding<br /> dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(),<br /> probe(), and aoecmd_cfg_rsp(). This patch fixed this issue.