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scd:openpgp: Fix a segv for cards supporting unknown curves.

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* common/openpgp-oid.c (get_keyalgo_string): Do not strdup NULL.
--

Cherry pick 2.4/master commit of:
	385f4841330e277949ddf2f13939b97481d2d29c

GnuPG-bug-id: 5963
This commit is contained in:
Werner Koch 2022-05-05 09:04:28 +02:00 committed by NIIBE Yutaka
parent ad2d578cba
commit 600e69b461
No known key found for this signature in database
GPG Key ID: 640114AF89DE6054
1 changed files with 2 additions and 2 deletions
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4
common/openpgp-oid.c
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@ -580,7 +580,7 @@ get_keyalgo_string (enum gcry_pk_algos algo,
for (i=0; i < keyalgo_strings_used; i++) for (i=0; i < keyalgo_strings_used; i++)
{ {
if (keyalgo_strings[i].algo == algo if (keyalgo_strings[i].algo == algo
&& keyalgo_strings[i].curve && keyalgo_strings[i].curve && curve
&& !strcmp (keyalgo_strings[i].curve, curve)) && !strcmp (keyalgo_strings[i].curve, curve))
return keyalgo_strings[i].name; return keyalgo_strings[i].name;
} }
@ -594,7 +594,7 @@ get_keyalgo_string (enum gcry_pk_algos algo,
else else
name = xasprintf ("E_error"); name = xasprintf ("E_error");
nbits = 0; nbits = 0;
curvebuf = xstrdup (curve); curvebuf = curve? xstrdup (curve) : NULL;
} }
else else
{ {