git: d7ae385428ae - releng/13.2 - mbuf: Fix an offset calculation in m_apply_extpg_one()

The branch releng/13.2 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=d7ae385428ae8df4b5a39f752b389a9375597748

commit d7ae385428ae8df4b5a39f752b389a9375597748
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2021-11-10 21:57:12 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2023-03-24 23:56:47 +0000

    mbuf: Fix an offset calculation in m_apply_extpg_one()
    
    We were not including the requested starting offset in the page offset.
    
    Approved by:    re (cperciva)
    Reviewed by:    jhb
    Fixes:          3c7a01d773ac ("Extend m_apply() to support unmapped mbufs.")
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D32922
    
    (cherry picked from commit ac2b54441742b3148de72e3b29aa0f00d29bb825)
    (cherry picked from commit 70421fd527e315bbc4850db2d7e80fc008393bce)
---
 sys/kern/uipc_mbuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/uipc_mbuf.c b/sys/kern/uipc_mbuf.c
index 13c98d0895fa..abe292013d28 100644
--- a/sys/kern/uipc_mbuf.c
+++ b/sys/kern/uipc_mbuf.c
@@ -1293,7 +1293,7 @@ m_apply_extpg_one(struct mbuf *m, int off, int len,
 		pglen = m_epg_pagelen(m, i, pgoff);
 		if (off < pglen) {
 			count = min(pglen - off, len);
-			p = (void *)PHYS_TO_DMAP(m->m_epg_pa[i] + pgoff);
+			p = (void *)PHYS_TO_DMAP(m->m_epg_pa[i] + pgoff + off);
 			rval = f(arg, p, count);
 			if (rval)
 				return (rval);