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x86: fix assertion in ipi_send_cpu to range check the passed id

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Prior to the change for sufficiently bad id (and in particular NOCPU which is -1)
it would access memory outside of the cpu_apic_ids array.
This commit is contained in:
Mateusz Guzik 2020-01-19 21:35:51 +00:00
parent 95a8fce118
commit 44c78346f6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356897
1 changed files with 2 additions and 1 deletions
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sys/x86/x86/mp_x86.c
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@ -1233,7 +1233,8 @@ ipi_send_cpu(int cpu, u_int ipi)
u_int bitmap, old, new;
u_int *cpu_bitmap;
KASSERT(cpu_apic_ids[cpu] != -1, ("IPI to non-existent CPU %d", cpu));
KASSERT((u_int)cpu < MAXCPU && cpu_apic_ids[cpu] != -1,
("IPI to non-existent CPU %d", cpu));
if (IPI_IS_BITMAPED(ipi)) {
bitmap = 1 << ipi;