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s390x: sclp: fix error handling for oversize control blocks

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Requests over 4k are not a spec exception.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Message-Id: <1569591203-15258-4-git-send-email-imbrenda@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2019-09-27 15:33:22 +02:00 committed by Christian Borntraeger
parent 6f6c9333ef
commit d959f6cf50
1 changed files with 1 additions and 2 deletions
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hw/s390x/sclp.c
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@ -213,8 +213,7 @@ int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
/* Valid sccb sizes */
if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader)) {
r = -PGM_SPECIFICATION;
goto out;
}