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scd: Do not try to use a non-enabled app after card switching.

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* scd/app.c (app_dump_state): Also print the refcount.
(maybe_switch_app): Make sure the app exists on the card.
--

When switching the current card and the card does not support the same
apps as the former, we now reset the app to the first one.

Testcase is to use a standard OpenPGP card and a P15 card.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-11-26 12:16:56 +01:00
parent 764c69a841
commit d784e76349
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 19 additions and 2 deletions
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21
scd/app.c
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@ -304,8 +304,8 @@ app_dump_state (void)
npth_mutex_lock (&card_list_lock);
for (c = card_top; c; c = c->next)
{
log_info ("app_dump_state: card=%p slot=%d type=%s\n",
c, c->slot, strcardtype (c->cardtype));
log_info ("app_dump_state: card=%p slot=%d type=%s refcount=%u\n",
c, c->slot, strcardtype (c->cardtype), c->ref_count);
/* FIXME The use of log_info risks a race! */
for (a=c->app; a; a = a->next)
log_info ("app_dump_state: app=%p type='%s'\n",
@ -1435,6 +1435,23 @@ maybe_switch_app (ctrl_t ctrl, card_t card, const char *keyref)
{
/* For whatever reasons the current apptype has not been set -
* fix that and use the current app. */
if (DBG_APP)
log_debug ("slot %d: no current app switching to %s\n",
card->slot, strapptype (card->app->apptype));
ctrl->current_apptype = card->app->apptype;
return 0;
}
for (app = card->app; app; app = app->next)
if (app->apptype == ctrl->current_apptype)
break;
if (!app)
{
/* The current app is not supported by this card. Set the first
* app of the card as current. */
if (DBG_APP)
log_debug ("slot %d: current app %s not available switching to %s\n",
card->slot, strapptype (ctrl->current_apptype),
strapptype (card->app->apptype));
ctrl->current_apptype = card->app->apptype;
return 0;
}