CVE-2022-49017
tipc: re-fetch skb cb after tipc_msg_validate
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tipc: re-fetch skb cb after tipc_msg_validate
In the Linux kernel, the following vulnerability has been resolved: tipc: re-fetch skb cb after tipc_msg_validate As the call trace shows, the original skb was freed in tipc_msg_validate(), and dereferencing the old skb cb would cause an use-after-free crash. BUG: KASAN: use-after-free in tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] Call Trace: <IRQ> tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc] ... Allocated by task 47078: kmem_cache_alloc_node+0x158/0x4d0 __alloc_skb+0x1c1/0x270 tipc_buf_acquire+0x1e/0xe0 [tipc] tipc_msg_create+0x33/0x1c0 [tipc] tipc_link_build_proto_msg+0x38a/0x2100 [tipc] tipc_link_timeout+0x8b8/0xef0 [tipc] tipc_node_timeout+0x2a1/0x960 [tipc] call_timer_fn+0x2d/0x1c0 ... Freed by task 47078: tipc_msg_validate+0x7b/0x440 [tipc] tipc_crypto_rcv_complete+0x4b5/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc] This patch fixes it by re-fetching the skb cb from the new allocated skb after calling tipc_msg_validate().
Reserved 2024-08-22 | Published 2024-10-21 | Updated 2024-11-04 | Assigner Linuxgit.kernel.org/...c/a1ba595e35aa3afbe417ff0af353afb9f65559c0
git.kernel.org/...c/1daec0815655e110c6f206c5e777a4af8168ff58
git.kernel.org/...c/e128190adb2edfd5042105b5d1ed4553f295f5ef
git.kernel.org/...c/3067bc61fcfe3081bf4807ce65560f499e895e77
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