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sunrpc: svcauth_gss_register_pseudoflavor must reject duplicate registrations.

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There is no valid case for supporting duplicate pseudoflavor
registrations.
Currently the silent acceptance of such registrations is hiding a bug.
The rpcsec_gss_krb5 module registers 2 flavours but does not unregister
them, so if you load, unload, reload the module, it will happily
continue to use the old registration which now has pointers to the
memory were the module was originally loaded.  This could lead to
unexpected results.

So disallow duplicate registrations.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206651
Cc: stable@vger.kernel.org (v2.6.12+)
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
NeilBrown 2020-05-22 12:01:33 +10:00 committed by J. Bruce Fields
parent f45db2b909
commit d47a5dc288
1 changed files with 4 additions and 2 deletions
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6
net/sunrpc/auth_gss/svcauth_gss.c
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@ -826,9 +826,11 @@ svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
new->h.flavour = &svcauthops_gss;
new->pseudoflavor = pseudoflavor;
stat = 0;
test = auth_domain_lookup(name, &new->h);
if (test != &new->h) { /* Duplicate registration */
if (test != &new->h) {
pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
name);
stat = -EADDRINUSE;
auth_domain_put(test);
kfree(new->h.name);
goto out_free_dom;