CVE-2024-26754

In the Linux kernel, the following vulnerability has been resolved: gtp:
fix use-after-free and null-ptr-deref in gtp_genl_dump_pdp() The
gtp_net_ops pernet operations structure for the subsystem must be
registered before registering the generic netlink family. Syzkaller hit
‘general protection fault in gtp_genl_dump_pdp’ bug: general protection
fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1]
PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range
[0x0000000000000010-0x0000000000000017] CPU: 1 PID: 5826 Comm: gtp Not
tainted 6.8.0-rc3-std-def-alt1 #1 Hardware name: QEMU Standard PC (Q35 +
ICH9, 2009), BIOS 1.16.0-alt1 04/01/2014 RIP:
0010:gtp_genl_dump_pdp+0x1be/0x800 [gtp] Code: c6 89 c6 e8 64 e9 86 df 58
45 85 f6 0f 85 4e 04 00 00 e8 c5 ee 86 df 48 8b 54 24 18 48 b8 00 00 00 00
00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 de 05 00 00 48 8b 44 24 18 4c
8b 30 4c 39 f0 74 RSP: 0018:ffff888014107220 EFLAGS: 00010202 RAX:
dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX:
0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP:
0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10:
0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13:
ffff88800fcda588 R14: 0000000000000001 R15: 0000000000000000 FS:
00007f1be4eb05c0(0000) GS:ffff88806ce80000(0000) knlGS:0000000000000000 CS:
0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1be4e766cf CR3:
000000000c33e000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ?
show_regs+0x90/0xa0 ? die_addr+0x50/0xd0 ?
exc_general_protection+0x148/0x220 ? asm_exc_general_protection+0x22/0x30 ?
gtp_genl_dump_pdp+0x1be/0x800 [gtp] ? __alloc_skb+0x1dd/0x350 ?
__pfx___alloc_skb+0x10/0x10 genl_dumpit+0x11d/0x230
netlink_dump+0x5b9/0xce0 ? lockdep_hardirqs_on_prepare+0x253/0x430 ?
__pfx_netlink_dump+0x10/0x10 ? kasan_save_track+0x10/0x40 ?
__kasan_kmalloc+0x9b/0xa0 ? genl_start+0x675/0x970
__netlink_dump_start+0x6fc/0x9f0 genl_family_rcv_msg_dumpit+0x1bb/0x2d0 ?
__pfx_genl_family_rcv_msg_dumpit+0x10/0x10 ? genl_op_from_small+0x2a/0x440
? cap_capable+0x1d0/0x240 ? __pfx_genl_start+0x10/0x10 ?
__pfx_genl_dumpit+0x10/0x10 ? __pfx_genl_done+0x10/0x10 ?
security_capable+0x9d/0xe0