Date: Wed, 28 Jun 2000 02:20:17 +0200 (CEST) From: Marius Bendiksen <mbendiks@eunet.no> To: hackers@freebsd.org Subject: buffer cache question Message-ID: <Pine.BSF.4.05.10006280215070.14273-100000@login-1.eunet.no>
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In the following code, from /sys/kern/vfs_bio.c : bread(), it appears to
me that it is possible for a null pointer to be deferenced?
struct buf *bp;
bp = getblk(vp, blkno, size, 0, 0);
*bpp = bp;
/* if not found in cache, do some I/O */
if ((bp->b_flags & B_CACHE) == 0) {
It seems, from a very brief inspection of the code, as though getblk()
might return a null pointer under certain circumstances. I'd expect my
understanding of the code is flawed, as such a thing should have been
discovered ages ago, were it a bug, but I feel I should ask.
Marius
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