pktgen: Avoid out-of-bounds access in get_imix_entries

In the Linux kernel, the following vulnerability has been resolved:

pktgen: Avoid out-of-bounds access in get_imix_entries

Passing a sufficient amount of imix entries leads to invalid access to the

pkt_dev->imix_entries array because of the incorrect boundary check.

UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24

index 20 is out of range for type 'imix_pkt [20]'

CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)

Call Trace:

<TASK>

dump_stack_lvl lib/dump_stack.c:117

__ubsan_handle_out_of_bounds lib/ubsan.c:429

get_imix_entries net/core/pktgen.c:874

pktgen_if_write net/core/pktgen.c:1063

pde_write fs/proc/inode.c:334

proc_reg_write fs/proc/inode.c:346

vfs_write fs/read_write.c:593

ksys_write fs/read_write.c:644

do_syscall_64 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130

Found by Linux Verification Center (linuxtesting.org) with SVACE.

[ fp: allow to fill the array completely; minor changelog cleanup ]