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authorJohn Baldwin <jhb@FreeBSD.org>2021-07-26 21:03:28 +0000
committerJohn Baldwin <jhb@FreeBSD.org>2021-08-11 19:18:46 +0000
commit3e4aeeb95df217fdd9ec21e5a86ec61d1b2abc59 (patch)
tree5cc8a953c8ea194df4c0a03e47fd55c05af05d78
parent952226eedb0be32b2c952fb2ae12f76a62131c00 (diff)
downloadsrc-3e4aeeb95df217fdd9ec21e5a86ec61d1b2abc59.tar.gz
src-3e4aeeb95df217fdd9ec21e5a86ec61d1b2abc59.zip
m_dup: Handle unmapped mbufs as an input mbuf.
Use m_copydata() instead of a direct bcopy() when copying data out of a source mbuf into a newly-allocated mbuf. PR: 256610 Reported by: Niels Bakker <niels=freebsd@bakker.net> Reviewed by: markj MFC after: 2 weeks (cherry picked from commit be79f30d6c3e353856d4f82227b270abc26be702)
-rw-r--r--sys/kern/uipc_mbuf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/uipc_mbuf.c b/sys/kern/uipc_mbuf.c
index f7852bc7dd7f..f525c25d1431 100644
--- a/sys/kern/uipc_mbuf.c
+++ b/sys/kern/uipc_mbuf.c
@@ -719,7 +719,7 @@ m_dup(const struct mbuf *m, int how)
while (n->m_len < nsize && m != NULL) {
int chunk = min(nsize - n->m_len, m->m_len - moff);
- bcopy(m->m_data + moff, n->m_data + n->m_len, chunk);
+ m_copydata(m, moff, chunk, n->m_data + n->m_len);
moff += chunk;
n->m_len += chunk;
remain -= chunk;