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ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

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BugLink: https://bugs.launchpad.net/bugs/2102118

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>
CVE-2024-56626
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Jordy Zomer
2025-03-12 22:51:00 +09:00
committed by Stefan Bader
parent d3a5ff58ed
commit ec78cb6f7b
1 changed files with 2 additions and 0 deletions
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fs/smb/server/smb2pdu.c
+2
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@@ -6637,6 +6637,8 @@ int smb2_write(struct ksmbd_work *work)
}
offset = le64_to_cpu(req->Offset);
if (offset < 0)
return -EINVAL;
length = le32_to_cpu(req->Length);
if (req->Channel == SMB2_CHANNEL_RDMA_V1 ||