ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size validation could be skipped. if request size is smaller than sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in smb2_allocate_rsp_buf(). This patch allocate response buffer after decrypting transform request. smb3_decrypt_req() will validate transform request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().

References

• https://git.kernel.org/stable/c/da21401372607c49972ea87a6edaafb36a17c325
• https://git.kernel.org/stable/c/b80ba648714e6d790d69610cf14656be222d0248
• https://git.kernel.org/stable/c/3160d9734453a40db248487f8204830879c207f1
• https://git.kernel.org/stable/c/0977f89722eceba165700ea384f075143f012085
• https://git.kernel.org/stable/c/c119f4ede3fa90a9463f50831761c28f989bfb20