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virPCIVPDParseVPDLargeResourceFields: Report proper errors

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The code abused 'VIR_INFO' as an attempt at error reporting. Rework the
code to return the usual 0/-1 and raise proper errors.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2024-01-30 16:55:50 +01:00
parent a352bcf1c6
commit dfc85658bd
1 changed files with 35 additions and 32 deletions
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67
src/util/virpcivpd.c
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@ -404,12 +404,15 @@ virPCIVPDReadVPDBytes(int vpdFileFd,
* @csum: A pointer to a 1-byte checksum.
* @res: A pointer to virPCIVPDResource.
*
* Returns: a pointer to a VPDResource which needs to be freed by the caller or
* NULL if getting it failed for some reason.
* Returns 0 if the field was parsed sucessfully; -1 on error
*/
static bool
virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t resDataLen,
bool readOnly, uint8_t *csum, virPCIVPDResource *res)
static int
virPCIVPDParseVPDLargeResourceFields(int vpdFileFd,
uint16_t resPos,
uint16_t resDataLen,
bool readOnly,
uint8_t *csum,
virPCIVPDResource *res)
{
/* A buffer of up to one resource record field size (plus a zero byte) is needed. */
g_autofree uint8_t *buf = g_malloc0(PCI_VPD_MAX_FIELD_SIZE + 1);
@ -427,7 +430,7 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
/* Keyword resources consist of keywords (2 ASCII bytes per the spec) and 1-byte length. */
if (virPCIVPDReadVPDBytes(vpdFileFd, buf, 3, fieldPos, csum) < 0)
return false;
return -1;
fieldDataLen = buf[2];
/* Change the position to the field's data portion skipping the keyword and length bytes. */
@ -444,8 +447,9 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
case VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RDWR:
if (readOnly) {
VIR_INFO("Unexpected RW keyword in the read-only section.");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: unexpected RW keyword in read-only section"));
return -1;
}
bytesToRead = fieldDataLen;
@ -453,8 +457,9 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
case VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RESVD:
if (!readOnly) {
VIR_INFO("Unexpected RV keyword in the read-write section.");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: unexpected RV keyword in read-write section"));
return -1;
}
/* Only need one byte to be read and accounted towards
* the checksum calculation. */
@ -472,12 +477,13 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
if (resPos + resDataLen < fieldPos + fieldDataLen) {
/* In this case the field cannot simply be skipped since the position of the
* next field is determined based on the length of a previous field. */
VIR_INFO("A field data length violates the resource length boundary.");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: data field length invalid"));
return -1;
}
if (virPCIVPDReadVPDBytes(vpdFileFd, buf, bytesToRead, fieldPos, csum) < 0)
return false;
return -1;
/* Advance the position to the first byte of the next field. */
fieldPos += fieldDataLen;
@ -492,7 +498,6 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
if (!virPCIVPDResourceIsValidTextValue(fieldValue)) {
/* Skip fields with invalid values - this is safe assuming field length is
* correctly specified. */
VIR_DEBUG("A value for field %s contains invalid characters", fieldKeyword);
continue;
}
break;
@ -512,8 +517,9 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
case VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RESVD:
if (*csum) {
/* All bytes up to and including the checksum byte should add up to 0. */
VIR_INFO("Checksum validation has failed");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: invalid checksum"));
return -1;
}
hasChecksum = true;
goto done;
@ -540,16 +546,18 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
* they were not the last fields in the section. */
if ((fieldPos < resPos + resDataLen)) {
/* unparsed data still present */
VIR_DEBUG("PCI VPD data parsing failed");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: parsing ended prematurely"));
return -1;
}
if (readOnly && !hasChecksum) {
VIR_DEBUG("VPD-R does not contain the mandatory checksum");
return false;
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("failed to read the PCI VPD data: missing mandatory checksum"));
return -1;
}
return true;
return 0;
}
@ -606,7 +614,6 @@ virPCIVPDParse(int vpdFileFd)
uint8_t csum = 0;
uint8_t headerBuf[2];
bool isWellFormed = false;
uint16_t resPos = 0, resDataLen;
uint8_t tag = 0;
bool endResReached = false, hasReadOnly = false;
@ -659,20 +666,21 @@ virPCIVPDParse(int vpdFileFd)
&csum, res) < 0)
return NULL;
isWellFormed = true;
break;
/* Large resource type which is also a VPD-R: 0x80 | 0x10 == 0x90 */
case PCI_VPD_LARGE_RESOURCE_FLAG | PCI_VPD_READ_ONLY_LARGE_RESOURCE_FLAG:
isWellFormed = virPCIVPDParseVPDLargeResourceFields(vpdFileFd, resPos,
resDataLen, true, &csum, res);
if (virPCIVPDParseVPDLargeResourceFields(vpdFileFd, resPos,
resDataLen, true, &csum, res) < 0)
return NULL;
/* Encountered the VPD-R tag. The resource record parsing also validates
* the presence of the required checksum in the RV field. */
hasReadOnly = true;
break;
/* Large resource type which is also a VPD-W: 0x80 | 0x11 == 0x91 */
case PCI_VPD_LARGE_RESOURCE_FLAG | PCI_VPD_READ_WRITE_LARGE_RESOURCE_FLAG:
isWellFormed = virPCIVPDParseVPDLargeResourceFields(vpdFileFd, resPos, resDataLen,
false, &csum, res);
if (virPCIVPDParseVPDLargeResourceFields(vpdFileFd, resPos, resDataLen,
false, &csum, res) < 0)
return NULL;
break;
default:
/* While we cannot parse unknown resource types, they can still be skipped
@ -682,11 +690,6 @@ virPCIVPDParse(int vpdFileFd)
continue;
}
if (!isWellFormed) {
VIR_DEBUG("Encountered an invalid VPD");
return NULL;
}
/* Continue processing other resource records. */
resPos += resDataLen;
}