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Fixed a buffer overrun bug.

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This commit is contained in:
Greg King 2014-07-17 07:05:10 -04:00
parent 30aab9a6b2
commit c6e7d835ef
1 changed files with 9 additions and 6 deletions
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13
libsrc/cbm/seekdir.c
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@ -1,5 +1,6 @@
/*
** Ullrich von Bassewitz, 2012-06-03. Based on code by Groepaz.
** 2012-06-03, Ullrich von Bassewitz. Based on code by Groepaz.
** 2014-07-16, Greg King
*/
#include <fcntl.h>
@ -15,8 +16,10 @@ void __fastcall__ seekdir (register DIR* dir, long offs)
unsigned char count;
unsigned char buf[128];
/* Make sure we have a reasonable value for offs */
if (offs > 0x1000) {
/* Make sure that we have a reasonable value for offs. We reject
** negative numbers by converting them to (very high) unsigned values.
*/
if ((unsigned long)offs > 0x1000uL) {
errno = EINVAL;
return;
}
@ -32,7 +35,7 @@ void __fastcall__ seekdir (register DIR* dir, long offs)
}
/* Skip until we've reached the target offset in the directory */
o = dir->off = offs;
o = dir->off = (unsigned)offs;
while (o) {
/* Determine size of next chunk to read */
@ -40,7 +43,7 @@ void __fastcall__ seekdir (register DIR* dir, long offs)
count = sizeof (buf);
o -= sizeof (buf);
} else {
count = offs;
count = (unsigned char)o;
o = 0;
}