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Avoid possible memory-smashing bug, and rewrite some really stupid

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initialization code.
This commit is contained in:
hpa 2001-08-10 18:47:11 +00:00
parent 5b0cb11445
commit 11c90592b5
1 changed files with 17 additions and 19 deletions
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34
tftpd/tftpd.c
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@ -122,7 +122,7 @@ off_t tsize;
int tsize_ok;
int ndirs;
char **dirs;
const char **dirs;
int secure = 0;
int cancreate = 0;
@ -201,7 +201,7 @@ main(int argc, char **argv)
struct options *opt;
struct sockaddr_in myaddr;
struct sockaddr_in bindaddr;
int n = 0;
int n;
int on = 1;
int fd = 0;
int listen = 0; /* Standalone (listen) mode */
@ -268,19 +268,11 @@ main(int argc, char **argv)
break;
}
for (; optind != argc; optind++) {
if (dirs)
dirs = realloc(dirs, (ndirs+2) * sizeof (char *));
else
dirs = calloc(ndirs+2, sizeof(char *));
if (dirs == NULL) {
syslog(LOG_ERR, "malloc: %m");
exit(EX_OSERR);
}
dirs[n++] = argv[optind];
dirs[n] = NULL;
ndirs++;
}
dirs = xmalloc((argc-optind+1)*sizeof(char *));
for ( ndirs = 0 ; optind != argc ; optind++ )
dirs[ndirs++] = argv[optind];
dirs[ndirs] = NULL;
if (secure) {
if (ndirs == 0) {
@ -817,8 +809,10 @@ int
validate_access(char *filename, int mode, struct formats *pf)
{
struct stat stbuf;
int i, len;
int fd, wmode;
char *cp, **dirp;
char *cp;
const char **dirp;
tsize_ok = 0;
@ -829,9 +823,13 @@ validate_access(char *filename, int mode, struct formats *pf)
* prevent tricksters from getting around the directory
* restrictions
*/
for (cp = filename + 1; *cp; cp++)
if(*cp == '.' && strncmp(cp-1, "/../", 4) == 0)
len = strlen(filename);
for ( i = 1 ; i < len-3 ; i++ ) {
cp = filename + i;
if ( *cp == '.' && memcmp(cp-1, "/../", 4) == 0)
return(EACCESS);
}
for (dirp = dirs; *dirp; dirp++)
if (strncmp(filename, *dirp, strlen(*dirp)) == 0)
break;