Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: handle forward allocation error batadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb for each DHT candidate, but does not check the return value before passing it to batadv_send_skb_prepare_unicast_4addr(). That function dereferences the skb unconditionally, so a failed allocation triggers a NULL pointer dereference. Skip forwarding to the current DHT candidate on allocation failure.

References 8

• git.kernel.org https://git.kernel.org/stable/c/2d8826a2d3657cea66fb0370f9e521575a673871
• git.kernel.org https://git.kernel.org/stable/c/2edb8aeb3cdda9d00ec4997252dc5bcd6f54d8ef
• git.kernel.org https://git.kernel.org/stable/c/4d420d9ee70a220a2cd95aa0dd2e15acad66a505
• git.kernel.org https://git.kernel.org/stable/c/866ac1d57040ed0b44ca732e3c66b3aa6b93011c
• git.kernel.org https://git.kernel.org/stable/c/9bcebaedfb8479cb4affb23c7a0d000ca9a20e73
• git.kernel.org https://git.kernel.org/stable/c/9cceea8eeba710def2a5707ee00f00c74a9a1cac
• git.kernel.org https://git.kernel.org/stable/c/ce0c381199402a2c58f4599f4f6ed100d872d0da
• git.kernel.org https://git.kernel.org/stable/c/cf48e75fc4fe0d5cc7721c82d454221d01367b93

Remediation