[hackers] [sbase] ls: fix segfault when timestamp is out of range for struct tm || Mattias Andrée

[git]

commit dfc94e0221c0b830e49800e25e15c4ccad281b2c
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Sun Mar 27 14:49:45 2016 +0200
Commit:     sin <s...@2f30.org>
CommitDate: Wed Apr 20 22:57:40 2016 +0100

    ls: fix segfault when timestamp is out of range for struct tm
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/ls.c b/ls.c
index 3268a99..8cc285b 100644
--- a/ls.c
+++ b/ls.c
@@ -118,6 +118,7 @@ output(const struct entry *ent)
 {
        struct group *gr;
        struct passwd *pw;
+       struct tm *tm;
        ssize_t len;
        size_t l;
        char *name, *c, *u, *fmt, buf[BUFSIZ],
@@ -194,7 +195,10 @@ output(const struct entry *ent)
        else
                fmt = "%b %d %H:%M";
 
-       strftime(buf, sizeof(buf), fmt, localtime(&ent->t.tv_sec));
+       if ((tm = localtime(&ent->t.tv_sec)))
+               strftime(buf, sizeof(buf), fmt, tm);
+       else
+               snprintf(buf, sizeof(buf), "%lld", (long long)(ent->t.tv_sec));
        printf("%s %4ld %-8.8s %-8.8s ", mode, (long)ent->nlink, pwname, 
grname);
 
        if (S_ISBLK(ent->mode) || S_ISCHR(ent->mode))