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Fix a crash if -D' is used without -t title'

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dialog(3)'s dlg_reallocate_gauge(), used both by dialog(3)'s dialog_gauge()
and dialog(1)'s `--gauge', will segmentation fault in strlen(3) if no title
is set for the widget. Reproducible with `dialog --gauge hi 6 20' (adding
`--title ""' is enough to prevent segmentation fault).

MFC after:	3 days
X-MFC-to:	stable/10
This commit is contained in:
Devin Teske 2016-01-27 06:21:35 +00:00
parent 138b115fcb
commit b888adc784
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=294893
1 changed files with 7 additions and 0 deletions
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7
lib/libdpv/dialog_util.c
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@ -261,6 +261,13 @@ dialog_spawn_gauge(char *init_prompt, pid_t *pid)
errx(EXIT_FAILURE, "Out of memory?!");
sprintf(dargv[n++], "--title");
dargv[n++] = title;
} else {
if ((dargv[n] = malloc(8)) == NULL)
errx(EXIT_FAILURE, "Out of memory?!");
sprintf(dargv[n++], "--title");
if ((dargv[n] = malloc(8)) == NULL)
errx(EXIT_FAILURE, "Out of memory?!");
sprintf(dargv[n++], "");
}
if (backtitle != NULL) {
if ((dargv[n] = malloc(12)) == NULL)