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Fix multiple Coverity warnings in tftpd(8)

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* Initialize uninitialized variable (CID 1006502)
* strcpy => strlcpy (CID 1006792, 1006791, 1006790)
* Check function return values (CID 1009442, 1009441, 1009440)
* Delete dead code in receive_packet (not reported by Coverity)
* Remove redundant alarm(3) in receive_packet (not reported by Coverity)

Reported by:	Coverity
CID: 1006502, 1006792, 1006791, 1006790, 1009442, 1009441, 1009440
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D11287
This commit is contained in:
Alan Somers 2018-07-22 16:14:30 +00:00
parent 12395dc9f6
commit 3c0fa26534
4 changed files with 17 additions and 17 deletions
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4
libexec/tftpd/tftp-file.c
View File

@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/in.h>
#include <arpa/tftp.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
@ -80,7 +81,8 @@ convert_from_net(char *buffer, size_t count)
if (buffer[i] == '\n') {
if (n == 0) {
if (ftell(file) != 0) {
fseek(file, -1, SEEK_END);
int r = fseek(file, -1, SEEK_END);
assert(r == 0);
convbuffer[n++] = '\n';
} else {
/* This shouldn't happen */

16
libexec/tftpd/tftp-io.c
View File

@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
#include <arpa/tftp.h>
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
@ -395,7 +396,7 @@ receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
struct sockaddr_storage *pfrom;
socklen_t fromlen;
int n;
static int waiting;
static int timed_out;
if (debug&DEBUG_PACKETS)
tftp_log(LOG_DEBUG,
@ -403,23 +404,16 @@ receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
pkt = (struct tftphdr *)data;
waiting = 0;
signal(SIGALRM, timeout);
setjmp(timeoutbuf);
timed_out = setjmp(timeoutbuf);
alarm(thistimeout);
if (waiting > 0) {
alarm(0);
return (RP_TIMEOUT);
}
if (waiting > 0) {
if (timed_out != 0) {
tftp_log(LOG_ERR, "receive_packet: timeout");
alarm(0);
return (RP_TIMEOUT);
}
waiting++;
pfrom = (from == NULL) ? &from_local : from;
fromlen = sizeof(*pfrom);
n = recvfrom(peer, data, size, 0, (struct sockaddr *)pfrom, &fromlen);
@ -433,8 +427,6 @@ receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
return (RP_TIMEOUT);
}
alarm(0);
if (n < 0) {
/* No idea what could have happened if it isn't a timeout */
tftp_log(LOG_ERR, "receive_packet: %s", strerror(errno));

4
libexec/tftpd/tftp-utils.c
View File

@ -270,11 +270,13 @@ char *
rp_strerror(int error)
{
static char s[100];
size_t space = sizeof(s);
int i = 0;
while (rp_errors[i].desc != NULL) {
if (rp_errors[i].error == error) {
strcpy(s, rp_errors[i].desc);
strlcpy(s, rp_errors[i].desc, space);
space -= strlen(rp_errors[i].desc);
}
i++;
}

10
libexec/tftpd/tftpd.c
View File

@ -374,7 +374,10 @@ main(int argc, char *argv[])
exit(1);
}
chdir("/");
setgroups(1, &nobody->pw_gid);
if (setgroups(1, &nobody->pw_gid) != 0) {
tftp_log(LOG_ERR, "setgroups failed");
exit(1);
}
if (setuid(nobody->pw_uid) != 0) {
tftp_log(LOG_ERR, "setuid failed");
exit(1);
@ -522,7 +525,7 @@ tftp_wrq(int peer, char *recvbuffer, ssize_t size)
cp = parse_header(peer, recvbuffer, size, &filename, &mode);
size -= (cp - recvbuffer) + 1;
strcpy(fnbuf, filename);
strlcpy(fnbuf, filename, sizeof(fnbuf));
reduce_path(fnbuf);
filename = fnbuf;
@ -567,7 +570,7 @@ tftp_rrq(int peer, char *recvbuffer, ssize_t size)
cp = parse_header(peer, recvbuffer, size, &filename, &mode);
size -= (cp - recvbuffer) + 1;
strcpy(fnbuf, filename);
strlcpy(fnbuf, filename, sizeof(fnbuf));
reduce_path(fnbuf);
filename = fnbuf;
@ -804,6 +807,7 @@ tftp_xmitfile(int peer, const char *mode)
time_t now;
struct tftp_stats ts;
memset(&ts, 0, sizeof(ts));
now = time(NULL);
if (debug&DEBUG_SIMPLE)
tftp_log(LOG_DEBUG, "Transmitting file");