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Fixed overflow and sign extension bugs in

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`len = min(so->so_snd.sb_cc, win) - off;'.  min() has type u_int
and `off' has type int, so when min() is 0 and `off' is 1, the RHS
overflows to 0U - 1 = UINT_MAX.  `len' has type long, so when
sizeof(long) == sizeof(int), the LHS normally overflows to to the
correct value of -1, but when sizeof(long) > sizeof(int), the LHS
is UINT_MAX.

Fixed some u_long's that should have been fixed-sized types.
This commit is contained in:
Bruce Evans 1998-07-13 11:53:59 +00:00
parent 07a4df4fee
commit 9105bb4680
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=37623
1 changed files with 4 additions and 4 deletions
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8
sys/netinet/tcp_output.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_output.c 8.4 (Berkeley) 5/24/95
* $Id: tcp_output.c,v 1.29 1998/04/06 06:52:44 phk Exp $
* $Id: tcp_output.c,v 1.30 1998/05/24 18:41:04 fenner Exp $
*/
#include "opt_tcpdebug.h"
@ -148,7 +148,7 @@ again:
}
}
len = min(so->so_snd.sb_cc, win) - off;
len = (long)ulmin(so->so_snd.sb_cc, win) - off;
if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) {
taop = &tao_noncached;
@ -334,7 +334,7 @@ send:
if ((tp->t_flags & TF_REQ_SCALE) &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_SCALE))) {
*((u_long *) (opt + optlen)) = htonl(
*((u_int32_t *)(opt + optlen)) = htonl(
TCPOPT_NOP << 24 |
TCPOPT_WINDOW << 16 |
TCPOLEN_WINDOW << 8 |
@ -353,7 +353,7 @@ send:
(flags & TH_RST) == 0 &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_TSTMP))) {
u_long *lp = (u_long *)(opt + optlen);
u_int32_t *lp = (u_int32_t *)(opt + optlen);
/* Form timestamp option as shown in appendix A of RFC 1323. */
*lp++ = htonl(TCPOPT_TSTAMP_HDR);