This is a note to let you know that I've just added the patch titled
cifs: Fix signature miscalculation
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cifs-fix-signature-miscalculation.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a57e2c8cf2fb6e2d4ea9a7538c33bb01742a5305
Author: David Howells <dhowells@xxxxxxxxxx>
Date: Thu Sep 12 16:58:48 2024 +0100
cifs: Fix signature miscalculation
[ Upstream commit 5a20b7cb0d8d3ee490a8e088dc2584aa782e3355 ]
Fix the calculation of packet signatures by adding the offset into a page
in the read or write data payload when hashing the pages from it.
Fixes: 39bc58203f04 ("cifs: Add a function to Hash the contents of an iterator")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Tom Talpey <tom@xxxxxxxxxx>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx>
cc: Shyam Prasad N <nspmangalore@xxxxxxxxx>
cc: Rohith Surabattula <rohiths.msft@xxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: linux-cifs@xxxxxxxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/client/cifsencrypt.c b/fs/smb/client/cifsencrypt.c
index 6322f0f68a17..b0473c2567fe 100644
--- a/fs/smb/client/cifsencrypt.c
+++ b/fs/smb/client/cifsencrypt.c
@@ -129,7 +129,7 @@ static ssize_t cifs_shash_xarray(const struct iov_iter *iter, ssize_t maxsize,
for (j = foffset / PAGE_SIZE; j < npages; j++) {
len = min_t(size_t, maxsize, PAGE_SIZE - offset);
p = kmap_local_page(folio_page(folio, j));
- ret = crypto_shash_update(shash, p, len);
+ ret = crypto_shash_update(shash, p + offset, len);
kunmap_local(p);
if (ret < 0)
return ret;
