CVE-2021-47080

In the Linux kernel, the following vulnerability has been resolved:
RDMA/core: Prevent divide-by-zero error triggered by the user The
user_entry_size is supplied by the user and later used as a denominator to
calculate number of entries. The zero supplied by the user will trigger the
following divide-by-zero error: divide error: 0000 [#1] SMP KASAN PTI CPU:
4 PID: 497 Comm: c_repro Not tainted 5.13.0-rc1+ #281 Hardware name: QEMU
Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP:
0010:ib_uverbs_handler_UVERBS_METHOD_QUERY_GID_TABLE+0x1b1/0x510 Code: 87
59 03 00 00 e8 9f ab 1e ff 48 8d bd a8 00 00 00 e8 d3 70 41 ff 44 0f b7 b5
a8 00 00 00 e8 86 ab 1e ff 31 d2 4c 89 f0 31 ff <49> f7 f5 48 89 d6 48 89
54 24 10 48 89 04 24 e8 1b ad 1e ff 48 8b RSP: 0018:ffff88810416f828
EFLAGS: 00010246 RAX: 0000000000000008 RBX: 1ffff1102082df09 RCX:
ffffffff82183f3d RDX: 0000000000000000 RSI: ffff888105f2da00 RDI:
0000000000000000 RBP: ffff88810416fa98 R08: 0000000000000001 R09:
ffffed102082df5f R10: ffff88810416faf7 R11: ffffed102082df5e R12:
0000000000000000 R13: 0000000000000000 R14: 0000000000000008 R15:
ffff88810416faf0 FS: 00007f5715efa740(0000) GS:ffff88811a700000(0000)
knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000840 CR3: 000000010c2e0001 CR4: 0000000000370ea0 DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3:
0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ?
ib_uverbs_handler_UVERBS_METHOD_INFO_HANDLES+0x4b0/0x4b0
ib_uverbs_cmd_verbs+0x1546/0x1940 ib_uverbs_ioctl+0x186/0x240
__x64_sys_ioctl+0x38a/0x1220 do_syscall_64+0x3f/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae