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ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

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commit 313dab082289e460391c82d855430ec8a28ddf81 upstream.

An offset from client could be a negative value, It could allows
to write data outside the bounds of the allocated buffer.
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 09:33:25 +09:00
committed by Greg Kroah-Hartman
parent de4d790dcf
commit 8cd7490fc0
1 changed files with 2 additions and 0 deletions
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2
fs/smb/server/smb2pdu.c
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@@ -6587,6 +6587,8 @@ int smb2_write(struct ksmbd_work *work)
} }
offset = le64_to_cpu(req->Offset); offset = le64_to_cpu(req->Offset);
if (offset < 0)
return -EINVAL;
length = le32_to_cpu(req->Length); length = le32_to_cpu(req->Length);
if (req->Channel == SMB2_CHANNEL_RDMA_V1 || if (req->Channel == SMB2_CHANNEL_RDMA_V1 ||