git: 59ce044a7856 - main - sockets: on shutdown(2) do sorflush() only in case of generic sockbuf

The branch main has been updated by glebius:

URL: https://cgit.FreeBSD.org/src/commit/?id=59ce044a7856b16803f7eb0aa5c54cfe6e13cff7

commit 59ce044a7856b16803f7eb0aa5c54cfe6e13cff7
Author:     Gleb Smirnoff <glebius@FreeBSD.org>
AuthorDate: 2024-01-09 01:20:31 +0000
Commit:     Gleb Smirnoff <glebius@FreeBSD.org>
CommitDate: 2024-01-09 01:20:31 +0000

    sockets: on shutdown(2) do sorflush() only in case of generic sockbuf
    
    This is a quick plug to fix panic with Netlink which has protocol specific
    buffers.  Note that PF_UNIX/SOCK_DGRAM, which also has its own buffers,
    avoids the panic due to being SOCK_DGRAM.  A correct but more complicated
    fix that needs to be done is to merge pr_shutdown, pr_flush and dom_dispose
    into one protocol method that may call sorflush for generic sockets or do
    their own stuff for protocol which has own buffers.
    
    Reviewed by:            tuexen
    Differential Revision:  https://reviews.freebsd.org/D43367
    Reported-by: syzbot+a58e1615881c01a51653@syzkaller.appspotmail.com
---
 sys/kern/uipc_socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index efa349d140ff..3409a7085df6 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -3007,7 +3007,7 @@ soshutdown(struct socket *so, int how)
 	pr = so->so_proto;
 	if (pr->pr_flush != NULL)
 		pr->pr_flush(so, how);
-	if (how != SHUT_WR)
+	if (how != SHUT_WR && !(pr->pr_flags & PR_SOCKBUF))
 		sorflush(so);
 	if (how != SHUT_RD) {
 		error = pr->pr_shutdown(so);