CVE-2023-52797

In the Linux kernel, the following vulnerability has been resolved:
drivers: perf: Check find_first_bit() return value We must check the return
value of find_first_bit() before using the return value as an index array
since it happens to overflow the array and then panic: [ 107.318430] Kernel
BUG [#1] [ 107.319434] CPU: 3 PID: 1238 Comm: kill Tainted: G E
6.6.0-rc6ubuntu-defconfig #2 [ 107.319465] Hardware name: riscv-virtio,qemu
(DT) [ 107.319551] epc : pmu_sbi_ovf_handler+0x3a4/0x3ae [ 107.319840] ra :
pmu_sbi_ovf_handler+0x52/0x3ae [ 107.319868] epc : ffffffff80a0a77c ra :
ffffffff80a0a42a sp : ffffaf83fecda350 [ 107.319884] gp : ffffffff823961a8
tp : ffffaf8083db1dc0 t0 : ffffaf83fecda480 [ 107.319899] t1 :
ffffffff80cafe62 t2 : 000000000000ff00 s0 : ffffaf83fecda520 [ 107.319921]
s1 : ffffaf83fecda380 a0 : 00000018fca29df0 a1 : ffffffffffffffff [
107.319936] a2 : 0000000001073734 a3 : 0000000000000004 a4 :
0000000000000000 [ 107.319951] a5 : 0000000000000040 a6 : 000000001d1c8774
a7 : 0000000000504d55 [ 107.319965] s2 : ffffffff82451f10 s3 :
ffffffff82724e70 s4 : 000000000000003f [ 107.319980] s5 : 0000000000000011
s6 : ffffaf8083db27c0 s7 : 0000000000000000 [ 107.319995] s8 :
0000000000000001 s9 : 00007fffb45d6558 s10: 00007fffb45d81a0 [ 107.320009]
s11: ffffaf7ffff60000 t3 : 0000000000000004 t4 : 0000000000000000 [
107.320023] t5 : ffffaf7f80000000 t6 : ffffaf8000000000 [ 107.320037]
status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
[ 107.320081] [<ffffffff80a0a77c>] pmu_sbi_ovf_handler+0x3a4/0x3ae [
107.320112] [<ffffffff800b42d0>] handle_percpu_devid_irq+0x9e/0x1a0 [
107.320131] [<ffffffff800ad92c>] generic_handle_domain_irq+0x28/0x36 [
107.320148] [<ffffffff8065f9f8>] riscv_intc_irq+0x36/0x4e [ 107.320166]
[<ffffffff80caf4a0>] handle_riscv_irq+0x54/0x86 [ 107.320189]
[<ffffffff80cb0036>] do_irq+0x64/0x96 [ 107.320271] Code: 85a6 855e b097
ff7f 80e7 9220 b709 9002 4501 bbd9 (9002) 6097 [ 107.320585] —[ end trace
0000000000000000 ]— [ 107.320704] Kernel panic - not syncing: Fatal
exception in interrupt [ 107.320775] SMP: stopping secondary CPUs [
107.321219] Kernel Offset: 0x0 from 0xffffffff80000000 [ 107.333051] —[
end Kernel panic - not syncing: Fatal exception in interrupt ]—