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phonet: pep: fix use-after-free in pep_get_sb()
In the Linux kernel, the following vulnerability has been resolved: phonet: pep: fix use-after-free in pep_get_sb() pep_get_sb() doesn't consider that pskb_may_pull() might have relocated the skb data, and continue to access the older pointer, causing UAF. Reproduced under KASAN: BUG: KASAN: slab-use-after-free in pep_get_sb+0x234/0x3b0 Read of size 1 at addr ff11000105510f50 by task repro/157 pep_get_sb+0x234/0x3b0 pipe_handler_do_rcv+0x5f7/0xa10 pep_do_rcv+0x203/0x410 __sk_receive_skb+0x471/0x4a0 phonet_rcv+0x5b3/0x6c0 __netif_receive_skb+0xcc/0x1d0 Refetch the header with skb_header_pointer() after pskb_may_pull(), so the possibly stale pointer is no longer dereferenced. There are better ways to solve this, but, this is the less instrusive one.
References
Affected products
- <8d931a75a38b9bb584a4071f5ebbd52755fc35ee
- <a48a889b60f73edb0399a8b08284a2ab0bd0295f
- =<6.6.*
- =<*
- <2.6.28
- =<6.18.*
- <25e3641beb51333bfbb155af2fd2573a61113af2
- =<6.12.*
- =<7.1.*
- ==2.6.28
- <0f71f852a96af9685858ce59fda34ecbf85c283d
- <17f78c0c0d41d738ee236eb6e841e39395188054