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cifs: Fix signature miscalculation

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[ Upstream commit 5a20b7cb0d ]

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: 39bc58203f ("cifs: Add a function to Hash the contents of an iterator")
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2024-09-12 16:58:48 +01:00 committed by Greg Kroah-Hartman
parent 6ec7cbc7f5
commit b9d510e085
1 changed files with 1 additions and 1 deletions
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2
fs/smb/client/cifsencrypt.c
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@ -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;