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newgrp: fix segmentation fault

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Fix segmentation fault in newgrp when xgetspnam() returns a NULL value
that is immediately freed.

The error was committed in
e65cc6aebc

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2019553

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
This commit is contained in:
Iker Pedrosa 2021-11-10 12:02:04 +01:00
parent 387da46d73
commit 497e90751b
1 changed files with 1 additions and 1 deletions
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2
src/newgrp.c
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@ -163,8 +163,8 @@ static void check_perms (const struct group *grp,
spwd = xgetspnam (pwd->pw_name);
if (NULL != spwd) {
pwd->pw_passwd = xstrdup (spwd->sp_pwdp);
spw_free (spwd);
}
spw_free (spwd);
if ((pwd->pw_passwd[0] == '\0') && (grp->gr_passwd[0] != '\0')) {
needspasswd = true;