Bug Summary

File:src/games/cribbage/instr.c
Warning:line 59, column 8
This function call is prohibited after a successful vfork

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name instr.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/games/cribbage/obj -resource-dir /usr/local/lib/clang/13.0.0 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/games/cribbage/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/games/cribbage/instr.c
1/* $OpenBSD: instr.c,v 1.14 2016/01/10 13:35:09 mestre Exp $ */
2/* $NetBSD: instr.c,v 1.5 1997/07/10 06:47:30 mikel Exp $ */
3
4/*-
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/wait.h>
34
35#include <err.h>
36#include <errno(*__errno()).h>
37#include <fcntl.h>
38#include <paths.h>
39#include <stdlib.h>
40#include <unistd.h>
41
42#include "pathnames.h"
43
44void
45instructions(void)
46{
47 int pstat;
48 int fd;
49 pid_t pid;
50 const char *pager;
51
52 if ((fd = open(_PATH_INSTR"/usr/share/games/cribbage.instr", O_RDONLY0x0000)) == - 1)
1
Assuming the condition is false
→
2
←
Taking false branch
→
53 errx(1, "can't open %s", _PATH_INSTR"/usr/share/games/cribbage.instr");
54
55 switch (pid = vfork()) {
3
←
Control jumps to 'case 0:' at line 58
→
56 case -1:
57 err(1, "vfork");
58 case 0:
59 if (!isatty(1))
4
←
This function call is prohibited after a successful vfork
60 pager = "/bin/cat";
61 else {
62 if (!(pager = getenv("PAGER")) || (*pager == 0))
63 pager = _PATH_MORE"/usr/bin/more";
64 }
65 if (dup2(fd, 0) == -1)
66 err(1, "dup2");
67 execl(_PATH_BSHELL"/bin/sh", "sh", "-c", pager, (char *)NULL((void *)0));
68 err(1, "exec sh -c %s", pager);
69 default:
70 do {
71 pid = waitpid(pid, &pstat, 0);
72 } while (pid == -1 && errno(*__errno()) == EINTR4);
73 close(fd);
74 if (pid == -1 || WEXITSTATUS(pstat)(int)(((unsigned)(pstat) >> 8) & 0xff))
75 exit(1);
76 break;
77 }
78}