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Avoid buffer overflow when constructing filenames.

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This commit is contained in:
tjr 2002-11-01 11:53:52 +00:00
parent 8818a9353d
commit f6cc8ac570
1 changed files with 13 additions and 3 deletions
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16
usr.bin/mkstr/mkstr.c
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@ -47,6 +47,7 @@ static char sccsid[] = "@(#)mkstr.c 8.1 (Berkeley) 6/6/93";
__FBSDID("$FreeBSD$");
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -95,6 +96,7 @@ int
main(int argc, char *argv[])
{
char addon = 0;
size_t namelen;
argc--, argv++;
if (argc > 1 && argv[0][0] == '-')
@ -109,11 +111,19 @@ main(int argc, char *argv[])
err(1, "%s", argv[0]);
inithash();
argc--, argv++;
strcpy(name, argv[0]);
np = name + strlen(name);
namelen = strlcpy(name, argv[0], sizeof(name));
if (namelen >= sizeof(name)) {
errno = ENAMETOOLONG;
err(1, "%s", argv[0]);
}
np = name + namelen;
argc--, argv++;
do {
strcpy(np, argv[0]);
if (strlcpy(np, argv[0], sizeof(name) - namelen) >=
sizeof(name) - namelen) {
errno = ENAMETOOLONG;
err(1, "%s%s", name, argv[0]);
}
if (freopen(name, "w", stdout) == NULL)
err(1, "%s", name);
if (freopen(argv[0], "r", stdin) == NULL)