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From 40c271164dbcebfc5304d0537a42fb42e6b6803c Mon Sep 17 00:00:00 2001
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From: Iker Pedrosa <ipedrosa@redhat.com>
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Date: Mon, 26 Sep 2022 12:16:53 +0200
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Subject: [PATCH] pam_lastlog: check localtime_r() return value
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Check the return value of localtime_r() before calling strftime(). This
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function crashes if the argument is NULL.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2012871
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Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
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---
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modules/pam_lastlog/pam_lastlog.c | 12 ++++++------
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1 file changed, 6 insertions(+), 6 deletions(-)
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diff --git a/modules/pam_lastlog/pam_lastlog.c b/modules/pam_lastlog/pam_lastlog.c
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index abd048df..121e7560 100644
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--- a/modules/pam_lastlog/pam_lastlog.c
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+++ b/modules/pam_lastlog/pam_lastlog.c
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@@ -573,12 +573,12 @@ last_login_failed(pam_handle_t *pamh, int announce, const char *user, time_t llt
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time_t lf_time;
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lf_time = utuser.ut_tv.tv_sec;
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- tm = localtime_r (&lf_time, &tm_buf);
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- strftime (the_time, sizeof (the_time),
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- /* TRANSLATORS: "strftime options for date of last login" */
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- _(" %a %b %e %H:%M:%S %Z %Y"), tm);
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-
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- date = the_time;
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+ if ((tm = localtime_r (&lf_time, &tm_buf)) != NULL) {
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+ strftime (the_time, sizeof (the_time),
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+ /* TRANSLATORS: "strftime options for date of last login" */
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+ _(" %a %b %e %H:%M:%S %Z %Y"), tm);
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+ date = the_time;
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+ }
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}
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/* we want & have the host? */
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--
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2.38.1
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