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storage: Don't dereference driver object if virStorageSource is not initialized

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virStorageFileReportBrokenChain uses data from the driver private data
pointer to print the user and group. This would lead to a crash in call
paths where we did not initialize the storage backend as recently added
in commit 24e47ee2b9 to qemuDomainDetermineDiskChain.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1522682
This commit is contained in:
Peter Krempa 2017-12-06 16:20:07 +01:00
parent c277034ed7
commit 2d07f1f0eb
1 changed files with 25 additions and 11 deletions
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14
src/storage/storage_source.c
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@ -419,6 +419,8 @@ virStorageFileReportBrokenChain(int errcode,
virStorageSourcePtr src,
virStorageSourcePtr parent)
{
if (src->drv) {
unsigned int access_user = src->drv->uid;
unsigned int access_group = src->drv->gid;
@ -433,6 +435,18 @@ virStorageFileReportBrokenChain(int errcode,
"of storage file '%s' (as uid:%u, gid:%u)"),
src->path, parent->path, access_user, access_group);
}
} else {
if (src == parent) {
virReportSystemError(errcode,
_("Cannot access storage file '%s'"),
src->path);
} else {
virReportSystemError(errcode,
_("Cannot access backing file '%s' "
"of storage file '%s'"),
src->path, parent->path);
}
}
}