[Devel] [PATCH RHEL COMMIT] include/linux/sockptr: introduce vmemdup_sockptr helper

[Konstantin Khorenko]

The commit is pushed to "branch-rh9-5.14.vz9.1.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after ark-5.14
------>
commit 4c09d662b7a49971d24b030bf9305496902de408
Author: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
Date:   Thu Sep 30 16:03:51 2021 +0300

    include/linux/sockptr: introduce vmemdup_sockptr helper
    
    This helper is needed for next patch
    
    https://jira.sw.ru/browse/PSBM-133996
    Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
---
 include/linux/sockptr.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
index ea193414298b..3538721a348c 100644
--- a/include/linux/sockptr.h
+++ b/include/linux/sockptr.h
@@ -10,6 +10,7 @@
 
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/mm.h>
 
 typedef struct {
 	union {
@@ -77,6 +78,19 @@ static inline void *memdup_sockptr(sockptr_t src, size_t len)
 	return p;
 }
 
+static inline void *vmemdup_sockptr(sockptr_t src, size_t len)
+{
+	void *p = kvmalloc(len, GFP_USER);
+
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+	if (copy_from_sockptr(p, src, len)) {
+		kvfree(p);
+		return ERR_PTR(-EFAULT);
+	}
+	return p;
+}
+
 static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
 {
 	char *p = kmalloc_track_caller(len + 1, GFP_KERNEL);