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Fix FS#12266, by skipping empty frames when reading ID3v2 tags. Also add some length checks to be safe.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30550 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Magnus Holmgren 2011-09-14 17:30:45 +00:00
parent c222f38c03
commit e995d01570
1 changed files with 12 additions and 8 deletions
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20
apps/metadata/id3tags.c
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@ -579,7 +579,7 @@ static int unicode_munge(char* string, char* utf8buf, int *len) {
if(str[1] == 0)
le = true;
do {
while ((i < *len) && (str[0] || str[1])) {
if(le)
utf8 = utf16LEdecode(str, utf8, 1);
else
@ -587,7 +587,7 @@ static int unicode_munge(char* string, char* utf8buf, int *len) {
str+=2;
i += 2;
} while((str[0] || str[1]) && (i < *len));
}
*utf8++ = 0; /* Terminate the string */
templen += (strlen(&utf8buf[templen]) + 1);
@ -962,10 +962,10 @@ void setid3v2title(int fd, struct mp3entry *entry)
if((tr->tag_length == 4 && !memcmp( header, "COMM", 4)) ||
(tr->tag_length == 3 && !memcmp( header, "COM", 3))) {
int offset;
if(!strncmp(tag+4, "iTun", 4)) {
if(bytesread >= 8 && !strncmp(tag+4, "iTun", 4)) {
#if CONFIG_CODEC == SWCODEC
/* check for iTunes gapless information */
if(!strncmp(tag+4, "iTunSMPB", 8))
if(bytesread >= 12 && !strncmp(tag+4, "iTunSMPB", 8))
itunes_gapless = true;
else
#endif
@ -1000,6 +1000,10 @@ void setid3v2title(int fd, struct mp3entry *entry)
bytesread--;
}
if(bytesread == 0)
/* Skip empty frames */
break;
tag[bytesread] = 0;
bufferpos += bytesread + 1;
@ -1040,10 +1044,6 @@ void setid3v2title(int fd, struct mp3entry *entry)
#endif
if( tr->ppFunc )
bufferpos = tr->ppFunc(entry, tag, bufferpos);
/* Seek to the next frame */
if(framelen < totframelen)
lseek(fd, totframelen - framelen, SEEK_CUR);
break;
}
}
@ -1059,6 +1059,10 @@ void setid3v2title(int fd, struct mp3entry *entry)
if( lseek(fd, totframelen, SEEK_CUR) == -1 )
return;
}
} else {
/* Seek to the next frame */
if(framelen < totframelen)
lseek(fd, totframelen - framelen, SEEK_CUR);
}
}
}