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virpcivpd: Bring variables into loops

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I've noticed one function inside virpcivpd.c, namely
virPCIVPDParseVPDLargeResourceFields() that declares some
variables at the top level even though they are used only inside
a loop in which they have to be freed explicitly.

Bringing variable declarations into the loop allows us to make
the code nicer.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Tim Wiederhake <twiederh@redhat.com>
This commit is contained in:
Michal Privoznik 2021-11-02 17:23:41 +01:00
parent bed0329b1c
commit ad8ba5b199
1 changed files with 4 additions and 15 deletions
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19
src/util/virpcivpd.c
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@ -456,10 +456,6 @@ bool
virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t resDataLen,
bool readOnly, uint8_t *csum, virPCIVPDResource *res)
{
g_autofree char *fieldKeyword = NULL;
g_autofree char *fieldValue = NULL;
virPCIVPDResourceFieldValueFormat fieldFormat = VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_LAST;
/* 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);
uint16_t fieldDataLen = 0, bytesToRead = 0;
@ -473,6 +469,10 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
* just occupy 3 header bytes. In the in case of the RW field this may mean that
* no more space is left in the section. */
while (fieldPos + 3 <= resPos + resDataLen) {
virPCIVPDResourceFieldValueFormat fieldFormat = VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_LAST;
g_autofree char *fieldKeyword = NULL;
g_autofree char *fieldValue = NULL;
/* Keyword resources consist of keywords (2 ASCII bytes per the spec) and 1-byte length. */
if (virPCIVPDReadVPDBytes(vpdFileFd, buf, 3, fieldPos, csum) != 3) {
/* Invalid field encountered which means the resource itself is invalid too. Report
@ -548,8 +548,6 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
/* 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);
g_free(g_steal_pointer(&fieldKeyword));
g_free(g_steal_pointer(&fieldValue));
continue;
}
} else if (fieldFormat == VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RESVD) {
@ -559,19 +557,13 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
return false;
}
hasChecksum = true;
g_free(g_steal_pointer(&fieldKeyword));
g_free(g_steal_pointer(&fieldValue));
break;
} else if (fieldFormat == VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RDWR) {
/* Skip the read-write space since it is used for indication only. */
hasRW = true;
g_free(g_steal_pointer(&fieldKeyword));
g_free(g_steal_pointer(&fieldValue));
break;
} else if (fieldFormat == VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_LAST) {
/* Skip unknown fields */
g_free(g_steal_pointer(&fieldKeyword));
g_free(g_steal_pointer(&fieldValue));
continue;
} else {
fieldValue = g_malloc(fieldDataLen);
@ -591,9 +583,6 @@ virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t re
_("Could not update the VPD resource keyword: %s"), fieldKeyword);
return false;
}
/* No longer need those since copies were made during the keyword update. */
g_free(g_steal_pointer(&fieldKeyword));
g_free(g_steal_pointer(&fieldValue));
}
/* May have exited the loop prematurely in case RV or RW were encountered and