Date: Tue, 1 Jun 2021 15:37:06 +0800 From: butt3rflyh4ck <butterflyhuangxx@...il.com> To: oss-security@...ts.openwall.com Subject: Linux kernel: nfc: null ptr dereference in llcp_sock_getname Hi, there was a null pointer dereference in llcp_sock_getname in net/nfc/llcp_sock.c and reproduced it in linux-5.13.0-rc2. An unprivileged user can trigger this bug and cause denial of service. #Root Cause After creating an nfc socket, bind the address by calling bind(), if LLCP_SAP_MAX was used as SAP, it cause the bind() failed and there would set llcp_sock->service_name as NULL. Although bind() returns an error here, it does not affect calling other socket functions. sock_getname() would invoke llcp_sock_getname(), llcp_sock_getname copied service name from llcp_sock->service_name by memcpy but llcp_sock->service_name is NULL. #Fix the patch for this issue: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=4ac06a1e013c #CVE CVE not assigned. #Credits Active Defense Lab of Venustech. Regards, butt3rflyh4ck. -- Active Defense Lab of Venustech
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