Date: Sun, 5 May 1996 15:25:27 +0900 (JST) From: enami@ba2.so-net.or.jp To: FreeBSD-gnats-submit@freebsd.org Subject: kern/1174: uninitialized auto variable shmseg is used in shget_allocate_segment Message-ID: <199605050625.PAA12300@euphoria.enami.ba2.so-net.or.jp> Resent-Message-ID: <199605050720.AAA03518@freefall.freebsd.org>
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>Number: 1174
>Category: kern
>Synopsis: uninitialized auto variable shmseg is used in shget_allocate_segment
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun May 5 00:20:01 PDT 1996
>Last-Modified:
>Originator: enami tsugutomo
>Organization:
>Release: FreeBSD 2.2-CURRENT i386
>Environment:
FreeBSD current around 1996 May 4 (GMT+0900)
>Description:
When compiling kern/sysv_shm.c, compile gives following warning.
cc -c -O -W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Winline -nostdinc -I. -I../.. -I../../sys -I../../../include -DI386_CPU -DI486_CPU -DDIAGNOSTIC -DCOMPAT_43 -DCD9660 -DNFS -DFFS -DINET -DKERNEL ../../kern/sysv_shm.c
../../kern/sysv_shm.c: In function `shmget_allocate_segment':
../../kern/sysv_shm.c:459: warning: `shmseg' might be used uninitialized in this function
>How-To-Repeat:
Compile kernel with option SYSVSHM.
>Fix:
I think it is a typo introduced during sysv_shm.c 1.18 and 1.19. Here is
a diff to correct it.
Index: sysv_shm.c
===================================================================
RCS file: /mnt/freebsd/src/sys/kern/sysv_shm.c,v
retrieving revision 1.20
diff -u -r1.20 sysv_shm.c
--- sysv_shm.c 1996/05/03 21:01:24 1.20
+++ sysv_shm.c 1996/05/05 05:36:00
@@ -463,7 +463,7 @@
return EINVAL;
if (shm_nused >= shminfo.shmmni) /* any shmids left? */
return ENOSPC;
- size = round_page(shmseg->shm_segsz);
+ size = round_page(uap->size);
if (shm_committed + btoc(size) > shminfo.shmall)
return ENOMEM;
if (shm_last_free < 0) {
>Audit-Trail:
>Unformatted:
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