UBSAN: Undefined behaviour in drivers/char/random.c

[20535.919065] ===========================================================================
[20535.919080] UBSAN: Undefined behaviour in drivers/char/random.c:705:19
[20535.919089] signed integer overflow:
[20535.919095] 1024 + 2147483568 cannot be represented in type 'int'
[20535.919109] CPU: 1 PID: 1476284 Comm: exe Kdump: loaded Tainted: G
[20535.919115] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[20535.919119] Call trace:
[20535.919139] dump_backtrace+0x0/0x310
[20535.919147] show_stack+0x28/0x38
[20535.919159] dump_stack+0xd8/0x108
[20535.919172] ubsan_epilogue+0x1c/0x94
[20535.919180] handle_overflow+0x14c/0x19c
[20535.919190] __ubsan_handle_add_overflow+0x34/0x44
[20535.919200] credit_entropy_bits+0x5d0/0x658
[20535.919207] _xfer_secondary_pool+0x120/0x3c0
[20535.919214] xfer_secondary_pool+0xb8/0xd0
[20535.919222] _random_read.part.13+0x10c/0x790
[20535.919229] random_read+0x68/0x88
[20535.919239] __vfs_read+0xe0/0x320
[20535.919247] vfs_read+0xbc/0x1c0
[20535.919255] ksys_read+0xdc/0x1b8
[20535.919263] __arm64_sys_read+0x50/0x60
[20535.919272] el0_svc_common+0xb4/0x1d8
[20535.919280] el0_svc_handler+0x50/0xa8
[20535.919287] el0_svc+0x8/0xc
[20535.919291] =============================================================================

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kernel version: 4.19.90

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