git: 40c711523e3a - stable/13 - net: add if_allocdescr() to permit updating iface description from the kernel

The branch stable/13 has been updated by melifaro:

URL: https://cgit.FreeBSD.org/src/commit/?id=40c711523e3ae6323294c2a1ec8285e494a338da

commit 40c711523e3ae6323294c2a1ec8285e494a338da
Author:     Alexander V. Chernikov <melifaro@FreeBSD.org>
AuthorDate: 2022-11-30 13:49:07 +0000
Commit:     Alexander V. Chernikov <melifaro@FreeBSD.org>
CommitDate: 2023-01-23 22:10:07 +0000

    net: add if_allocdescr() to permit updating iface description from the kernel
    
    Reviewed by:    kp,zlei
    Differential Revision: https://reviews.freebsd.org/D37566
    MFC after:      2 weeks
    
    (cherry picked from commit 984b27d879e14d88834ddfb7b9f9a4c40a84c492)
---
 sys/net/if.c     | 10 ++++++++--
 sys/net/if_var.h |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index 813525c2e7bd..4df376cbc7a6 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -2573,8 +2573,7 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 		else if (ifr_buffer_get_length(ifr) == 0)
 			descrbuf = NULL;
 		else {
-			descrbuf = malloc(ifr_buffer_get_length(ifr),
-			    M_IFDESCR, M_WAITOK | M_ZERO);
+			descrbuf = if_allocdescr(ifr_buffer_get_length(ifr), M_WAITOK);
 			error = copyin(ifr_buffer_get_buffer(ifr), descrbuf,
 			    ifr_buffer_get_length(ifr) - 1);
 			if (error) {
@@ -4163,6 +4162,13 @@ if_setdescr(if_t ifp, char *descrbuf)
 	if_freedescr(odescrbuf);
 }
 
+char *
+if_allocdescr(size_t sz, int malloc_flag)
+{
+	malloc_flag &= (M_WAITOK | M_NOWAIT);
+	return (malloc(sz, M_IFDESCR, M_ZERO | malloc_flag));
+}
+
 void
 if_freedescr(char *descrbuf)
 {
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 6738f00a4f08..c0f7de44dc55 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -709,6 +709,7 @@ int if_setcapenablebit(if_t ifp, int setcap, int clearcap);
 int if_getcapenable(if_t ifp);
 const char *if_getdname(if_t ifp);
 void if_setdescr(if_t ifp, char *descrbuf);
+char *if_allocdescr(size_t sz, int malloc_flag);
 void if_freedescr(char *descrbuf);
 int if_setdev(if_t ifp, void *dev);
 int if_setdrvflagbits(if_t ifp, int if_setflags, int clear_flags);