6.12-stable review patch. If anyone has any objections, please let me know.
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From: Norbert Szetei norbert@doyensec.com
commit bab703ed8472aa9d109c5f8c1863921533363dae upstream.
Add missing bounds check for create lease context.
Cc: stable@vger.kernel.org Reported-by: Norbert Szetei norbert@doyensec.com Tested-by: Norbert Szetei norbert@doyensec.com Signed-off-by: Norbert Szetei norbert@doyensec.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 --- fs/smb/server/oplock.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/fs/smb/server/oplock.c +++ b/fs/smb/server/oplock.c @@ -1505,6 +1505,10 @@ struct lease_ctx_info *parse_lease_state if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) { struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
+ if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) < + sizeof(struct create_lease_v2) - 4) + return NULL; + memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); lreq->req_state = lc->lcontext.LeaseState; lreq->flags = lc->lcontext.LeaseFlags; @@ -1517,6 +1521,10 @@ struct lease_ctx_info *parse_lease_state } else { struct create_lease *lc = (struct create_lease *)cc;
+ if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) < + sizeof(struct create_lease)) + return NULL; + memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); lreq->req_state = lc->lcontext.LeaseState; lreq->flags = lc->lcontext.LeaseFlags;