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upstream: Check return values of dup2. Spotted by Coverity, ok djm@

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OpenBSD-Commit-ID: 19fb1b53072826d00c67df677731d2f6c1dd602b
This commit is contained in:
dtucker@openbsd.org 2023-03-03 03:12:24 +00:00 committed by Darren Tucker
parent e37261dff3
commit 93291bd723
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2 changed files with 14 additions and 8 deletions
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8
scp.c
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@ -1,4 +1,4 @@
/* $OpenBSD: scp.c,v 1.252 2023/01/10 23:22:15 millert Exp $ */
/* $OpenBSD: scp.c,v 1.253 2023/03/03 03:12:24 dtucker Exp $ */
/*
* scp - secure remote copy. This is basically patched BSD rcp which
* uses ssh to do the data transfer (instead of using rcmd).
@ -394,8 +394,10 @@ do_cmd2(char *host, char *remuser, int port, char *cmd,
/* Fork a child to execute the command on the remote host using ssh. */
pid = fork();
if (pid == 0) {
dup2(fdin, 0);
dup2(fdout, 1);
if (dup2(fdin, 0) == -1)
perror("dup2");
if (dup2(fdout, 1) == -1)
perror("dup2");
replacearg(&args, 0, "%s", ssh_program);
if (port != -1) {

14
sshd.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sshd.c,v 1.597 2023/02/10 04:47:19 djm Exp $ */
/* $OpenBSD: sshd.c,v 1.598 2023/03/03 03:12:24 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -2117,17 +2117,21 @@ main(int ac, char **av)
if (rexec_flag) {
debug("rexec start in %d out %d newsock %d pipe %d sock %d",
sock_in, sock_out, newsock, startup_pipe, config_s[0]);
dup2(newsock, STDIN_FILENO);
dup2(STDIN_FILENO, STDOUT_FILENO);
if (dup2(newsock, STDIN_FILENO) == -1)
debug3_f("dup2 stdin: %s", strerror(errno));
if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1)
debug3_f("dup2 stdout: %s", strerror(errno));
if (startup_pipe == -1)
close(REEXEC_STARTUP_PIPE_FD);
else if (startup_pipe != REEXEC_STARTUP_PIPE_FD) {
dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD);
if (dup2(startup_pipe, REEXEC_STARTUP_PIPE_FD) == -1)
debug3_f("dup2 startup_p: %s", strerror(errno));
close(startup_pipe);
startup_pipe = REEXEC_STARTUP_PIPE_FD;
}
dup2(config_s[1], REEXEC_CONFIG_PASS_FD);
if (dup2(config_s[1], REEXEC_CONFIG_PASS_FD) == -1)
debug3_f("dup2 config_s: %s", strerror(errno));
close(config_s[1]);
ssh_signal(SIGHUP, SIG_IGN); /* avoid reset to SIG_DFL */