CVE-2023-53679

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: mt7601u: fix an integer underflow<br /> <br /> Fix an integer underflow that leads to a null pointer dereference in<br /> &amp;#39;mt7601u_rx_skb_from_seg()&amp;#39;. The variable &amp;#39;dma_len&amp;#39; in the URB packet<br /> could be manipulated, which could trigger an integer underflow of<br /> &amp;#39;seg_len&amp;#39; in &amp;#39;mt7601u_rx_process_seg()&amp;#39;. This underflow subsequently<br /> causes the &amp;#39;bad_frame&amp;#39; checks in &amp;#39;mt7601u_rx_skb_from_seg()&amp;#39; to be<br /> bypassed, eventually leading to a dereference of the pointer &amp;#39;p&amp;#39;, which<br /> is a null pointer.<br /> <br /> Ensure that &amp;#39;dma_len&amp;#39; is greater than &amp;#39;min_seg_len&amp;#39;.<br /> <br /> Found by a modified version of syzkaller.<br /> <br /> KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]<br /> CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G W O 5.14.0+<br /> #139<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS<br /> rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014<br /> RIP: 0010:skb_add_rx_frag+0x143/0x370<br /> Code: e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 86 01 00 00 4c 8d 7d 08 44<br /> 89 68 08 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 3c 02<br /> 00 0f 85 cd 01 00 00 48 8b 45 08 a8 01 0f 85 3d 01 00 00<br /> RSP: 0018:ffffc900000cfc90 EFLAGS: 00010202<br /> RAX: dffffc0000000000 RBX: ffff888115520dc0 RCX: 0000000000000000<br /> RDX: 0000000000000001 RSI: ffff8881118430c0 RDI: ffff8881118430f8<br /> RBP: 0000000000000000 R08: 0000000000000e09 R09: 0000000000000010<br /> R10: ffff888111843017 R11: ffffed1022308602 R12: 0000000000000000<br /> R13: 0000000000000e09 R14: 0000000000000010 R15: 0000000000000008<br /> FS: 0000000000000000(0000) GS:ffff88811a800000(0000)<br /> knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 000000004035af40 CR3: 00000001157f2000 CR4: 0000000000750ef0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> PKRU: 55555554<br /> Call Trace:<br /> mt7601u_rx_tasklet+0xc73/0x1270<br /> ? mt7601u_submit_rx_buf.isra.0+0x510/0x510<br /> ? tasklet_action_common.isra.0+0x79/0x2f0<br /> tasklet_action_common.isra.0+0x206/0x2f0<br /> __do_softirq+0x1b5/0x880<br /> ? tasklet_unlock+0x30/0x30<br /> run_ksoftirqd+0x26/0x50<br /> smpboot_thread_fn+0x34f/0x7d0<br /> ? smpboot_register_percpu_thread+0x370/0x370<br /> kthread+0x3a1/0x480<br /> ? set_kthread_struct+0x120/0x120<br /> ret_from_fork+0x1f/0x30<br /> Modules linked in: 88XXau(O) 88x2bu(O)<br /> ---[ end trace 57f34f93b4da0f9b ]---<br /> RIP: 0010:skb_add_rx_frag+0x143/0x370<br /> Code: e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 86 01 00 00 4c 8d 7d 08 44<br /> 89 68 08 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 3c 02<br /> 00 0f 85 cd 01 00 00 48 8b 45 08 a8 01 0f 85 3d 01 00 00<br /> RSP: 0018:ffffc900000cfc90 EFLAGS: 00010202<br /> RAX: dffffc0000000000 RBX: ffff888115520dc0 RCX: 0000000000000000<br /> RDX: 0000000000000001 RSI: ffff8881118430c0 RDI: ffff8881118430f8<br /> RBP: 0000000000000000 R08: 0000000000000e09 R09: 0000000000000010<br /> R10: ffff888111843017 R11: ffffed1022308602 R12: 0000000000000000<br /> R13: 0000000000000e09 R14: 0000000000000010 R15: 0000000000000008<br /> FS: 0000000000000000(0000) GS:ffff88811a800000(0000)<br /> knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 000000004035af40 CR3: 00000001157f2000 CR4: 0000000000750ef0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> PKRU: 55555554