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Fix possible overwriting of memory in vff.c

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d0k3 2021-02-01 18:59:55 +01:00
parent 899c8a8816
commit 58fb9913d5
1 changed files with 12 additions and 7 deletions
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19
arm9/source/filesys/vff.c
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@ -257,7 +257,8 @@ FRESULT worker_fvx_rmkdir (TCHAR* tpath) {
FRESULT fvx_rmkdir (const TCHAR* path) { FRESULT fvx_rmkdir (const TCHAR* path) {
#if !_LFN_UNICODE // this will not work for unicode #if !_LFN_UNICODE // this will not work for unicode
TCHAR tpath[_MAX_FN_LEN+1]; TCHAR tpath[_MAX_FN_LEN+1];
strncpy(tpath, path, _MAX_FN_LEN); if (strlen(path) > _MAX_FN_LEN) return FR_INVALID_NAME;
strcpy(tpath, path);
return worker_fvx_rmkdir( tpath ); return worker_fvx_rmkdir( tpath );
#else #else
return FR_DENIED; return FR_DENIED;
@ -267,7 +268,8 @@ FRESULT fvx_rmkdir (const TCHAR* path) {
FRESULT fvx_rmkpath (const TCHAR* path) { FRESULT fvx_rmkpath (const TCHAR* path) {
#if !_LFN_UNICODE // this will not work for unicode #if !_LFN_UNICODE // this will not work for unicode
TCHAR tpath[_MAX_FN_LEN+1]; TCHAR tpath[_MAX_FN_LEN+1];
strncpy(tpath, path, _MAX_FN_LEN); if (strlen(path) > _MAX_FN_LEN) return FR_INVALID_NAME;
strcpy(tpath, path);
TCHAR* slash = strrchr(tpath, '/'); TCHAR* slash = strrchr(tpath, '/');
if (!slash) return FR_DENIED; if (!slash) return FR_DENIED;
*slash = '\0'; *slash = '\0';
@ -295,7 +297,7 @@ FRESULT worker_fvx_runlink (TCHAR* tpath) {
while (fvx_readdir(&pdir, &fno) == FR_OK) { while (fvx_readdir(&pdir, &fno) == FR_OK) {
if ((strncmp(fno.fname, ".", 2) == 0) || (strncmp(fno.fname, "..", 3) == 0)) if ((strncmp(fno.fname, ".", 2) == 0) || (strncmp(fno.fname, "..", 3) == 0))
continue; // filter out virtual entries continue; // filter out virtual entries
strncpy(fname, fno.fname, tpath + 255 - fname); strcpy(fname, fno.fname);
if (fno.fname[0] == 0) { if (fno.fname[0] == 0) {
break; break;
} else { // return value won't matter } else { // return value won't matter
@ -313,7 +315,8 @@ FRESULT worker_fvx_runlink (TCHAR* tpath) {
FRESULT fvx_runlink (const TCHAR* path) { FRESULT fvx_runlink (const TCHAR* path) {
#if !_LFN_UNICODE // this will not work for unicode #if !_LFN_UNICODE // this will not work for unicode
TCHAR tpath[_MAX_FN_LEN+1]; TCHAR tpath[_MAX_FN_LEN+1];
strncpy(tpath, path, _MAX_FN_LEN); if (strlen(path) > _MAX_FN_LEN) return FR_INVALID_NAME;
strcpy(tpath, path);
return worker_fvx_runlink( tpath ); return worker_fvx_runlink( tpath );
#else #else
return FR_DENIED; return FR_DENIED;
@ -356,7 +359,8 @@ FRESULT fvx_preaddir (DIR* dp, FILINFO* fno, const TCHAR* pattern) {
} }
FRESULT fvx_findpath (TCHAR* path, const TCHAR* pattern, BYTE mode) { FRESULT fvx_findpath (TCHAR* path, const TCHAR* pattern, BYTE mode) {
strncpy(path, pattern, _MAX_FN_LEN); if (strlen(pattern) > _MAX_FN_LEN) return FR_INVALID_NAME;
strcpy(path, pattern);
TCHAR* fname = strrchr(path, '/'); TCHAR* fname = strrchr(path, '/');
if (!fname) return FR_DENIED; if (!fname) return FR_DENIED;
*fname = '\0'; *fname = '\0';
@ -376,7 +380,7 @@ FRESULT fvx_findpath (TCHAR* path, const TCHAR* pattern, BYTE mode) {
while ((fvx_preaddir(&pdir, &fno, npattern) == FR_OK) && *(fno.fname)) { while ((fvx_preaddir(&pdir, &fno, npattern) == FR_OK) && *(fno.fname)) {
int cmp = strncmp(fno.fname, fname, _MAX_FN_LEN); int cmp = strncmp(fno.fname, fname, _MAX_FN_LEN);
if (((mode & FN_HIGHEST) && (cmp > 0)) || ((mode & FN_LOWEST) && (cmp < 0)) || !(*fname)) if (((mode & FN_HIGHEST) && (cmp > 0)) || ((mode & FN_LOWEST) && (cmp < 0)) || !(*fname))
strncpy(fname, fno.fname, _MAX_FN_LEN - (fname - path)); strcpy(fname, fno.fname);
if (!(mode & (FN_HIGHEST|FN_LOWEST))) break; if (!(mode & (FN_HIGHEST|FN_LOWEST))) break;
} }
fvx_closedir( &pdir ); fvx_closedir( &pdir );
@ -385,7 +389,8 @@ FRESULT fvx_findpath (TCHAR* path, const TCHAR* pattern, BYTE mode) {
} }
FRESULT fvx_findnopath (TCHAR* path, const TCHAR* pattern) { FRESULT fvx_findnopath (TCHAR* path, const TCHAR* pattern) {
strncpy(path, pattern, _MAX_FN_LEN); if (strlen(pattern) > _MAX_FN_LEN) return FR_INVALID_NAME;
strcpy(path, pattern);
TCHAR* fname = strrchr(path, '/'); TCHAR* fname = strrchr(path, '/');
if (!fname) return FR_DENIED; if (!fname) return FR_DENIED;
fname++; fname++;