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scd: Protect PCSC.CONTEXT in apdu_dev_list_start.

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* scd/apdu.c (apdu_dev_list_start): Make sure using valid
PCSC.CONTEXT.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-05-13 10:35:08 +09:00
parent 310b064f52
commit 3802703ef2
1 changed files with 6 additions and 0 deletions
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6
scd/apdu.c
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@ -2018,12 +2018,14 @@ apdu_dev_list_start (const char *portstr, struct dev_list **l_p)
pcsc_dword_t nreader;
char *p = NULL;
npth_mutex_lock (&reader_table_lock);
if (!pcsc.context)
{
/* log_debug ("%s: No context - calling init\n", __func__); */
if (pcsc_init () < 0)
{
xfree (dl);
npth_mutex_unlock (&reader_table_lock);
return gpg_error (GPG_ERR_NO_SERVICE);
}
}
@ -2040,6 +2042,7 @@ apdu_dev_list_start (const char *portstr, struct dev_list **l_p)
if (pcsc.count == 0)
release_pcsc_context ();
xfree (dl);
npth_mutex_unlock (&reader_table_lock);
return err;
}
r = pcsc_list_readers (pcsc.context, NULL, p, &nreader);
@ -2052,9 +2055,12 @@ apdu_dev_list_start (const char *portstr, struct dev_list **l_p)
if (pcsc.count == 0)
release_pcsc_context ();
xfree (dl);
npth_mutex_unlock (&reader_table_lock);
return iso7816_map_sw (pcsc_error_to_sw (r));
}
npth_mutex_unlock (&reader_table_lock);
dl->table = p;
dl->idx_max = 0;