Date: Fri, 14 May 2021 14:28:37 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 255881] [PATCH] netsmb: Fix a use after free in smb_t2_request_int Message-ID: <bug-255881-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255881 Bug ID: 255881 Summary: [PATCH] netsmb: Fix a use after free in smb_t2_request_int Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: lylgood@foxmail.com Created attachment 224944 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D224944&action= =3Dedit adds a variable "sr_flags" to avoid the uaf bug. Bug File: sys/netsmb/smb_rq.c In function smb_t2_request_int, rqp is allocated by smb_rq_alloc(...,&rqp) = and with flags SMBR_ALLOCED set. In the freerq branch of smb_t2_request_int, smb_rq_done() is called to free the rqp. But later, the freed rqp is dereferenced by rqp->sr_flags, which is a uaf bug. My patch adds a variable "sr_flags" to avoid the uaf bug. --=20 You are receiving this mail because: You are the assignee for the bug.=
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