# SDL: fix invalid out of bounds UTF8 handling

**URL:** <https://discourse.libsdl.org/t/sdl-fix-invalid-out-of-bounds-utf8-handling/30921>\
**Category:** SDL Commits\
**Created:** [March 17, 2021, 1:52am UTC](https://discourse.libsdl.org/t/sdl-fix-invalid-out-of-bounds-utf8-handling/30921 "2021-03-17T01:52:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![SDLPushPostBot](https://discourse.libsdl.org/user_avatar/discourse.libsdl.org/sdlpushpostbot/32/4370_2.png) [@SDLPushPostBot](https://discourse.libsdl.org/u/SDLPushPostBot)\
**Post date:** [March 17, 2021, 1:52am UTC](https://discourse.libsdl.org/t/sdl-fix-invalid-out-of-bounds-utf8-handling/30921/1 "2021-03-17T01:52:08Z")

</div>

> <https://github.com/libsdl-org/SDL/commit/559be8aab4a0e666fa6fc9104570c9c9d3c54f12>

```diff
From 559be8aab4a0e666fa6fc9104570c9c9d3c54f12 Mon Sep 17 00:00:00 2001
From: Ankith <[EMAIL REDACTED]>
Date: Mon, 15 Mar 2021 15:18:10 +0530
Subject: [PATCH] fix invalid out of bounds UTF8 handling

---
 src/stdlib/SDL_iconv.c | 53 ++----------------------------------------
 1 file changed, 2 insertions(+), 51 deletions(-)

diff --git a/src/stdlib/SDL_iconv.c b/src/stdlib/SDL_iconv.c
index f360aa2af..004e7741c 100644
--- a/src/stdlib/SDL_iconv.c
+++ b/src/stdlib/SDL_iconv.c
@@ -369,33 +369,7 @@ SDL_iconv(SDL_iconv_t cd,
                 Uint8 *p = (Uint8 *) src;
                 size_t left = 0;
                 SDL_bool overlong = SDL_FALSE;
- if (p[0] >= 0xFC) {
- if ((p[0] & 0xFE) != 0xFC) {
- /* Skip illegal sequences
- return SDL_ICONV_EILSEQ;
- */
- ch = UNKNOWN_UNICODE;
- } else {
- if (p[0] == 0xFC && srclen > 1 && (p[1] & 0xFC) == 0x80) {
- overlong = SDL_TRUE;
- }
- ch = (Uint32) (p[0] & 0x01);
- left = 5;
- }
- } else if (p[0] >= 0xF8) {
- if ((p[0] & 0xFC) != 0xF8) {
- /* Skip illegal sequences
- return SDL_ICONV_EILSEQ;
- */
- ch = UNKNOWN_UNICODE;
- } else {
- if (p[0] == 0xF8 && srclen > 1 && (p[1] & 0xF8) == 0x80) {
- overlong = SDL_TRUE;
- }
- ch = (Uint32) (p[0] & 0x03);
- left = 4;
- }
- } else if (p[0] >= 0xF0) {
+ if (p[0] >= 0xF0) {
                     if ((p[0] & 0xF8) != 0xF0) {
                         /* Skip illegal sequences
                            return SDL_ICONV_EILSEQ;
@@ -670,7 +644,7 @@ SDL_iconv(SDL_iconv_t cd,
                     p[2] = 0x80 | (Uint8) (ch & 0x3F);
                     dst += 3;
                     dstlen -= 3;
- } else if (ch <= 0x1FFFFF) {
+ } else {
                     if (dstlen < 4) {
                         return SDL_ICONV_E2BIG;
                     }
@@ -680,29 +654,6 @@ SDL_iconv(SDL_iconv_t cd,
                     p[3] = 0x80 | (Uint8) (ch & 0x3F);
                     dst += 4;
                     dstlen -= 4;
- } else if (ch <= 0x3FFFFFF) {
- if (dstlen < 5) {
- return SDL_ICONV_E2BIG;
- }
- p[0] = 0xF8 | (Uint8) ((ch >> 24) & 0x03);
- p[1] = 0x80 | (Uint8) ((ch >> 18) & 0x3F);
- p[2] = 0x80 | (Uint8) ((ch >> 12) & 0x3F);
- p[3] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
- p[4] = 0x80 | (Uint8) (ch & 0x3F);
- dst += 5;
- dstlen -= 5;
- } else {
- if (dstlen < 6) {
- return SDL_ICONV_E2BIG;
- }
- p[0] = 0xFC | (Uint8) ((ch >> 30) & 0x01);
- p[1] = 0x80 | (Uint8) ((ch >> 24) & 0x3F);
- p[2] = 0x80 | (Uint8) ((ch >> 18) & 0x3F);
- p[3] = 0x80 | (Uint8) ((ch >> 12) & 0x3F);
- p[4] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
- p[5] = 0x80 | (Uint8) (ch & 0x3F);
- dst += 6;
- dstlen -= 6;
                 }
             }
             break;

```