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ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read

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commit fc342cf86e upstream.

An offset from client could be a negative value, It could lead
to an out-of-bounds read from the stream_buf.
Note that this issue is coming when setting
'vfs objects = streams_xattr parameter' in ksmbd.conf.

Cc: stable@vger.kernel.org # v5.15+
Reported-by: Jordy Zomer <jordyzomer@google.com>
Signed-off-by: Jordy Zomer <jordyzomer@google.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jordy Zomer 2024-11-28 09:32:45 +09:00 committed by Greg Kroah-Hartman
parent 1aece96620
commit 81eed63193
1 changed files with 4 additions and 0 deletions
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4
fs/smb/server/smb2pdu.c
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@ -6651,6 +6651,10 @@ int smb2_read(struct ksmbd_work *work)
}
offset = le64_to_cpu(req->Offset);
if (offset < 0) {
err = -EINVAL;
goto out;
}
length = le32_to_cpu(req->Length);
mincount = le32_to_cpu(req->MinimumCount);