From 67fcb2c598bc7643f694e8194d5c300a52af5aa9 Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Thu, 29 Dec 2022 14:04:46 -0800 Subject: cifs: Fix kmap_local_page() unmapping kmap_local_page() requires kunmap_local() to unmap the mapping. In addition memcpy_page() is provided to perform this common memcpy pattern. Replace the kmap_local_page() and broken kunmap() with memcpy_page() Fixes: d406d26745ab ("cifs: skip alloc when request has no pages") Reviewed-by: Paulo Alcantara Reviewed-by: "Fabio M. De Francesco" Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Ira Weiny Signed-off-by: Steve French --- fs/cifs/smb2ops.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) (limited to 'fs') diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index dc160de7a6de..0d7e9bcd9f34 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -4488,17 +4488,12 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst, /* copy pages form the old */ for (j = 0; j < npages; j++) { - char *dst, *src; unsigned int offset, len; rqst_page_get_length(new, j, &len, &offset); - dst = kmap_local_page(new->rq_pages[j]) + offset; - src = kmap_local_page(old->rq_pages[j]) + offset; - - memcpy(dst, src, len); - kunmap(new->rq_pages[j]); - kunmap(old->rq_pages[j]); + memcpy_page(new->rq_pages[j], offset, + old->rq_pages[j], offset, len); } } -- cgit v1.2.3