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Preventing a theoretically possible negative array index in find_utf8_start()

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Thomas Schmitt 2015-09-28 11:36:45 +02:00
parent 72ef369a40
commit b9ec876c40
1 changed files with 1 additions and 1 deletions
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libisofs/util.c
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@ -2358,7 +2358,7 @@ int find_utf8_start(char *name, int idx, int flag)
uname= (unsigned char *) name; uname= (unsigned char *) name;
if ((uname[idx] & 0xc0) != 0x80) if ((uname[idx] & 0xc0) != 0x80)
return idx; /* not an UTF-8 tail byte */ return idx; /* not an UTF-8 tail byte */
for (i = 0; i < 5; i++) { /* up to deprecated 6-byte codes */ for (i = 0; i < 5 && idx - 1 - i >= 0; i++) { /* up to deprecated 6-byte codes */
uch = uname[idx - 1 - i]; uch = uname[idx - 1 - i];
if ((uch & 0xe0) == 0xc0 || (uch & 0xf0) == 0xe0 || if ((uch & 0xe0) == 0xc0 || (uch & 0xf0) == 0xe0 ||
(uch & 0xf8) == 0xf0 || (uch & 0xfc) == 0xf8 || (uch & 0xf8) == 0xf0 || (uch & 0xfc) == 0xf8 ||