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s390x: sclp: Report insufficient SCCB length

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Return the correct error code when the SCCB buffer is too small to
contain all of the output, for the Read SCP Information and
Read CPU Information commands.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Message-Id: <1569591203-15258-5-git-send-email-imbrenda@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Claudio Imbrenda 2019-09-27 15:33:23 +02:00 committed by Christian Borntraeger
parent d959f6cf50
commit 832be0d8a3
1 changed files with 12 additions and 0 deletions
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12
hw/s390x/sclp.c
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@ -68,6 +68,12 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
if (be16_to_cpu(sccb->h.length) <
(sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
return;
}
/* Configuration Characteristic (Extension) */
s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
read_info->conf_char);
@ -118,6 +124,12 @@ static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
cpu_info->nr_standby = cpu_to_be16(0);
if (be16_to_cpu(sccb->h.length) <
(sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
return;
}
/* The standby offset is 16-byte for each CPU */
cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
+ cpu_info->nr_configured*sizeof(CPUEntry));