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Make sure that uio_resid isn't negative in read().

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This commit is contained in:
David Greenman 1994-09-02 14:04:39 +00:00
parent 01825ed3fa
commit dd968eae1a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2461
1 changed files with 5 additions and 1 deletions
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6
sys/kern/sys_generic.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
* $Id$
* $Id: sys_generic.c,v 1.3 1994/08/02 07:42:38 davidg Exp $
*/
#include <sys/param.h>
@ -86,7 +86,11 @@ read(p, uap, retval)
aiov.iov_len = uap->nbyte;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = uap->nbyte;
if (auio.uio_resid < 0)
return (EINVAL);
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;