tree 96a9fd12da42c4856d769d0d2b7db23f924572be
parent 8cba4c2698e282aa03948b74ebc259925c873402
author Dan Carpenter <dan.carpenter@oracle.com> 1632256415 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1632989464 +0200

cifs: fix a sign extension bug

[ Upstream commit e946d3c887a9dc33aa82a349c6284f4a084163f4 ]

The problem is the mismatched types between "ctx->total_len" which is
an unsigned int, "rc" which is an int, and "ctx->rc" which is a
ssize_t.  The code does:

	ctx->rc = (rc == 0) ? ctx->total_len : rc;

We want "ctx->rc" to store the negative "rc" error code.  But what
happens is that "rc" is type promoted to a high unsigned int and
'ctx->rc" will store the high positive value instead of a negative
value.

The fix is to change "rc" from an int to a ssize_t.

Fixes: c610c4b619e5 ("CIFS: Add asynchronous write support through kernel AIO")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>