Commit fd554396 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Fix lease context buffer parsing 



to prevent missing RqLs context if it's not the first one.

Signed-off-by: default avatarPavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: default avatarSteven French <steven@steven-GA-970A-DS3.(none)>
parent 6658b9f7

fs/cifs/smb2pdu.c

+7 −6
Original line number Diff line number Diff line
@@ -853,23 +853,24 @@ parse_lease_state(struct smb2_create_rsp *rsp) 
	char *data_offset;

	struct create_lease *lc;

	bool found = false;

	unsigned int next = 0;

	char *name;



	data_offset = (char *)rsp;

	data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);

	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);

	lc = (struct create_lease *)data_offset;

	do {

		char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;

		lc = (struct create_lease *)((char *)lc + next);

		name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;

		if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||

		    strncmp(name, "RqLs", 4)) {

			lc = (struct create_lease *)((char *)lc

					+ le32_to_cpu(lc->ccontext.Next));

			next = le32_to_cpu(lc->ccontext.Next);

			continue;

		}

		if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)

			return SMB2_OPLOCK_LEVEL_NOCHANGE;

		found = true;

		break;

	} while (le32_to_cpu(lc->ccontext.Next) != 0);

	} while (next != 0);



	if (!found)

		return 0;