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ksmbd: add low bound validation to FSCTL_SET_ZERO_DATA

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[ Upstream commit 2d74ec97131b1179a373b6d521f195c84e894eb6 ]

Smatch static checker warning:
 fs/ksmbd/smb2pdu.c:7759 smb2_ioctl()
 warn: no lower bound on 'off'

Fix unexpected result that could caused from negative off and bfz.

Fixes: b5e5f9dfc915 ("ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA")
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon 2023-03-05 21:04:00 +09:00 committed by Greg Kroah-Hartman
parent 7a83bb6d56
commit d897216325
1 changed files with 1 additions and 1 deletions
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2
fs/ksmbd/smb2pdu.c
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@ -7725,7 +7725,7 @@ int smb2_ioctl(struct ksmbd_work *work)
off = le64_to_cpu(zero_data->FileOffset);
bfz = le64_to_cpu(zero_data->BeyondFinalZero);
if (off > bfz) {
if (off < 0 || bfz < 0 || off > bfz) {
ret = -EINVAL;
goto out;
}