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rpc: libssh2: Fix regression in ssh host key verification

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Commit 792f81a40e caused a regression in the libssh2 host key
verification code by changing the variable type of 'i' to unsigned.
Since one of the loops used -1 as a special value if the asking
callback was found the conversion made a subsequent test always fail.

The bug was stealth enough to pass review, compilers and coverity.

Refactor the condition to avoid problems.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1047861
This commit is contained in:
Peter Krempa 2015-10-02 15:49:01 +02:00
parent 387c316e11
commit 9869f24d08
1 changed files with 4 additions and 6 deletions
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10
src/rpc/virnetsshsession.c
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@ -344,16 +344,14 @@ virNetSSHCheckHostKey(virNetSSHSessionPtr sess)
memset(&askKey, 0, sizeof(virConnectCredential));
for (i = 0; i < sess->cred->ncredtype; i++) {
if (sess->cred->credtype[i] == VIR_CRED_ECHOPROMPT) {
i = -1;
if (sess->cred->credtype[i] == VIR_CRED_ECHOPROMPT)
break;
}
}
if (i > 0) {
if (i == sess->cred->ncredtype) {
virReportError(VIR_ERR_SSH, "%s",
_("no suitable method to retrieve "
"authentication credentials"));
_("no suitable callback for host key "
"verification"));
return -1;
}