https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255881
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: [email protected]
Reporter: [email protected]
Created attachment 224944
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224944&action=edit
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.
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