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qemu: detect truncated file as invalid save image 

If managed save fails at the right point in time, then the save
image can end up with 0 bytes in length (no valid header), and
our attempts in commit 55d88def to detect and skip invalid save
files missed this case.

* src/qemu/qemu_driver.c (qemuDomainSaveImageOpen): Also unlink
empty file as corrupt.  Reported by Dennis Householder.
This commit is contained in:
Eric Blake 2011-12-15 17:28:18 -07:00
parent 13d5a6b83d
commit d99fe011a2
1 changed files with 9 additions and 0 deletions
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9
src/qemu/qemu_driver.c
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@ -3852,6 +3852,15 @@ qemuDomainSaveImageOpen(struct qemud_driver *driver,
goto error;
if (saferead(fd, &header, sizeof(header)) != sizeof(header)) {
if (unlink_corrupt) {
if (VIR_CLOSE(fd) < 0 || unlink(path) < 0) {
virReportSystemError(errno,
_("cannot remove corrupt file: %s"),
path);
goto error;
}
return -3;
}
qemuReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("failed to read qemu header"));
goto error;