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diff -up shadow-4.6/libmisc/prefix_flag.c.usermod-crash shadow-4.6/libmisc/prefix_flag.c
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--- shadow-4.6/libmisc/prefix_flag.c.usermod-crash 2018-04-29 18:42:37.000000000 +0200
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+++ shadow-4.6/libmisc/prefix_flag.c 2018-05-28 15:14:10.642302440 +0200
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@@ -319,6 +319,7 @@ extern struct group *prefix_getgr_nam_gi
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{
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long long int gid;
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char *endptr;
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+ struct group *g;
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if (NULL == grname) {
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return NULL;
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@@ -333,7 +334,8 @@ extern struct group *prefix_getgr_nam_gi
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&& (gid == (gid_t)gid)) {
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return prefix_getgrgid ((gid_t) gid);
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}
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- return prefix_getgrnam (grname);
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+ g = prefix_getgrnam (grname);
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+ return g ? __gr_dup(g) : NULL;
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}
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else
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return getgr_nam_gid(grname);
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diff -up shadow-4.6/src/usermod.c.usermod-crash shadow-4.6/src/usermod.c
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--- shadow-4.6/src/usermod.c.usermod-crash 2018-05-28 15:12:37.920332763 +0200
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+++ shadow-4.6/src/usermod.c 2018-05-28 15:15:50.337422470 +0200
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@@ -1276,11 +1276,13 @@ static void process_flags (int argc, cha
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prefix_user_home = xmalloc(len);
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wlen = snprintf(prefix_user_home, len, "%s/%s", prefix, user_home);
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assert (wlen == (int) len -1);
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+ if (user_newhome) {
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+ len = strlen(prefix) + strlen(user_newhome) + 2;
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+ prefix_user_newhome = xmalloc(len);
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+ wlen = snprintf(prefix_user_newhome, len, "%s/%s", prefix, user_newhome);
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+ assert (wlen == (int) len -1);
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+ }
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- len = strlen(prefix) + strlen(user_newhome) + 2;
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- prefix_user_newhome = xmalloc(len);
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- wlen = snprintf(prefix_user_newhome, len, "%s/%s", prefix, user_newhome);
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- assert (wlen == (int) len -1);
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}
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else {
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prefix_user_home = user_home;
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