Wed, Sep 06, 2023 at 09:51:11AM +0100, Daniel P. Berrang?? wrote:
> On Tue, Sep 05, 2023 at 12:44:25PM -0500, Praveen K Paladugu wrote:
> > Refactor the version processing logic in ch driver to support versions
> > from non-release cloud-hypervisor binaries. This version also supports
> > versions with branch prefixes in them.
> >
> > Signed-off-by: Praveen K Paladugu <[email protected]>
> > ---
> > src/ch/ch_conf.c | 39 ++++++++++++++++++++++++++++++++++++---
> > 1 file changed, 36 insertions(+), 3 deletions(-)
> >
> > diff --git a/src/ch/ch_conf.c b/src/ch/ch_conf.c
> > index a8565d9537..a0849bfbd6 100644
> > --- a/src/ch/ch_conf.c
> > +++ b/src/ch/ch_conf.c
> > @@ -172,6 +172,33 @@ virCHDriverConfigDispose(void *obj)
> >
> > #define MIN_VERSION ((15 * 1000000) + (0 * 1000) + (0))
> >
> > +/**
> > + * chPreProcessVersionString - crop branch, commit info and return just
> > the version
> > + */
> > +static char *
> > +chPreProcessVersionString(char *version)
> > +{
> > + g_autofree char *new_version = version;
> > + char *tmp_version;
> > +
> > + if ((tmp_version = strrchr(version, '/')) != NULL) {
> > + new_version = tmp_version + 1;
> > + }
> > +
> > + if (new_version[0] == 'v') {
> > + new_version = new_version + 1;
> > + }
>
> This is unsafe - 'new_version' is marked g_autofree, and
> this pointer manipulation will cause it to try to free
> a location /after/ the start of the allocation. Except
> you have no error paths, so the g_autofree will never
> trigger.
>
> Remove the g_autofree + g_steal_pointer as they're unsafe
> if the former ever ran.
Thanks Daniel.
I fixed this in the newer version. I applied g_autofree only to the returned
version.
Returned version is not manipulated in the calling method, so it can be freed
by g_autofree.
>
> > + // Duplicate the string in both cases. This would allow the calling
> > method
> > + // free the returned string in a consistent manner.
> > + if ((tmp_version = strchr(new_version, '-')) != NULL) {
> > + new_version = g_strndup(new_version, tmp_version - new_version);
> > + } else{
> > + new_version = g_strdup(new_version);
> > + }
> > +
> > + return g_steal_pointer(&new_version);
> > +
> > +}
> > int
> > chExtractVersion(virCHDriver *driver)
> > {
> > @@ -193,19 +220,25 @@ chExtractVersion(virCHDriver *driver)
> >
> > tmp = help;
> >
> > - /* expected format: cloud-hypervisor v<major>.<minor>.<micro> */
> > - if ((tmp = STRSKIP(tmp, "cloud-hypervisor v")) == NULL) {
> > + /* Below are some example version formats and expected outputs:
> > + * cloud-hypervisor v32.0.0 (expected: 32.0.0)
> > + * cloud-hypervisor v33.0-104-ge0e3779e-dirty (expected: 33.0)
> > + * cloud-hypervisor testing/v32.0.131-1-ga5d6db5c-dirty (expected:
> > 32.0.131)
> > + */
> > + if ((tmp = STRSKIP(tmp, "cloud-hypervisor ")) == NULL) {
> > virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> > _("Unexpected output of cloud-hypervisor binary"));
> > return -1;
> > }
> >
> > + tmp = chPreProcessVersionString(tmp);
> > + VIR_DEBUG("Cloud-Hypervisor version detected: %s", tmp);
> > +
> > if (virStringParseVersion(&version, tmp, true) < 0) {
> > virReportError(VIR_ERR_INTERNAL_ERROR,
> > _("Unable to parse cloud-hypervisor version:
> > %1$s"), tmp);
> > return -1;
> > }
> > -
> > if (version < MIN_VERSION) {
> > virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> > _("Cloud-Hypervisor version is too old (v15.0 is
> > the minimum supported version)"));
> > --
> > 2.41.0
> >
>
> With regards,
> Daniel
> --
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