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properly check the return value of read() & pread(). PR#26688.

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This commit is contained in:
mrg 2006-07-13 11:51:39 +00:00
parent f884703a86
commit 70e8425daf
1 changed files with 24 additions and 12 deletions
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36
usr.bin/gzip/gzip.c
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@ -1,4 +1,4 @@
/* $NetBSD: gzip.c,v 1.81 2005/12/13 10:02:04 wiz Exp $ */
/* $NetBSD: gzip.c,v 1.82 2006/07/13 11:51:39 mrg Exp $ */
/*
* Copyright (c) 1997, 1998, 2003, 2004 Matthew R. Green
@ -32,7 +32,7 @@
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004 Matthew R. Green\n\
All rights reserved.\n");
__RCSID("$NetBSD: gzip.c,v 1.81 2005/12/13 10:02:04 wiz Exp $");
__RCSID("$NetBSD: gzip.c,v 1.82 2006/07/13 11:51:39 mrg Exp $");
#endif /* not lint */
/*
@ -1256,7 +1256,7 @@ file_uncompress(char *file, char *outfile, size_t outsize)
ssize_t rbytes;
unsigned char header1[4];
enum filetype method;
int fd, ofd, zfd = -1;
int rv, fd, ofd, zfd = -1;
#ifndef SMALL
time_t timestamp = 0;
unsigned char name[PATH_MAX + 1];
@ -1286,7 +1286,7 @@ file_uncompress(char *file, char *outfile, size_t outsize)
if (rbytes == -1)
maybe_warn("can't read %s", file);
else
maybe_warnx("%s: unexpected end of file", file);
goto unexpected_EOF;
goto lose;
}
@ -1304,11 +1304,13 @@ file_uncompress(char *file, char *outfile, size_t outsize)
if (method == FT_GZIP && Nflag) {
unsigned char ts[4]; /* timestamp */
if (pread(fd, ts, sizeof ts, GZIP_TIMESTAMP) != sizeof ts) {
if (!fflag)
if ((rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP)) !=
sizeof ts) {
if (rv == -1 && !fflag)
maybe_warn("can't read %s", file);
goto lose;
}
} else if (rv == 0)
goto unexpected_EOF;
timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
if (header1[3] & ORIG_NAME) {
@ -1487,6 +1489,8 @@ file_uncompress(char *file, char *outfile, size_t outsize)
close(ofd);
return size;
unexpected_EOF:
maybe_warnx("%s: unexpected end of file", file);
lose:
if (fd != -1)
close(fd);
@ -1568,7 +1572,7 @@ handle_stdin(void)
maybe_warn("can't read stdin");
return;
} else if (bytes_read != sizeof(header1)) {
maybe_warnx("unexpected EOF");
maybe_warnx("(stdin): unexpected end of file");
return;
}
@ -1889,13 +1893,21 @@ print_list(int fd, off_t out, const char *outfile, time_t ts)
unsigned char buf[8];
uint32_t usize;
if (read(fd, (char *)buf, sizeof(buf)) != sizeof(buf))
rv = read(fd, (char *)buf, sizeof(buf));
if (rv == -1)
maybe_warn("read of uncompressed size");
usize = buf[4] | buf[5] << 8 | buf[6] << 16 | buf[7] << 24;
in = (off_t)usize;
else if (rv != sizeof(buf))
maybe_warnx("read of uncompressed size");
else {
usize = buf[4] | buf[5] << 8 |
buf[6] << 16 | buf[7] << 24;
in = (off_t)usize;
#ifndef SMALL
crc = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
crc = buf[0] | buf[1] << 8 |
buf[2] << 16 | buf[3] << 24;
#endif
}
}
}