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authorIra Weiny <ira.weiny@intel.com>2022-12-29 23:04:46 +0100
committerSteve French <stfrench@microsoft.com>2023-01-04 07:08:53 +0100
commit67fcb2c598bc7643f694e8194d5c300a52af5aa9 (patch)
treef90664b3b60ca5d1612a3634be8d0e3d44eb6eed /fs
parentLinux 6.2-rc2 (diff)
downloadlinux-67fcb2c598bc7643f694e8194d5c300a52af5aa9.tar.xz
linux-67fcb2c598bc7643f694e8194d5c300a52af5aa9.zip
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 <pc@cjr.nz> Reviewed-by: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/smb2ops.c9
1 files changed, 2 insertions, 7 deletions
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);
}
}