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ksmbd: fix out of bounds in smb3_decrypt_req()

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[ Upstream commit dc318846f3dd54574a36ae97fc8d8b75dd7cdb1e ]

smb3_decrypt_req() validate if pdu_length is smaller than
smb2_transform_hdr size.

Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21589
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon 2023-07-22 00:09:28 +09:00 committed by Greg Kroah-Hartman
parent 513eac8b85
commit 9776024ee0
1 changed files with 2 additions and 1 deletions
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3
fs/smb/server/smb2pdu.c
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@ -8713,7 +8713,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
struct smb2_transform_hdr *tr_hdr = smb2_get_msg(buf);
int rc = 0;
if (buf_data_size < sizeof(struct smb2_hdr)) {
if (pdu_length < sizeof(struct smb2_transform_hdr) ||
buf_data_size < sizeof(struct smb2_hdr)) {
pr_err("Transform message is too small (%u)\n",
pdu_length);
return -ECONNABORTED;