https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255866
Bug ID: 255866
Summary: [PATCH] dev/ocs_fc: Fix a use after free in
ocs_sport_free
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 224930
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224930&action=edit
add a new variable ocs
Bug File: sys/dev/ocs_fc/ocs_sport.c
In function ocs_sport_free, domain could be freed via
ocs_domain_post_event(domain,..)->ocs_domain_free(domain)->ocs_free(ocs,
domain, sizeof(*domain)).
But the freed domain is still used by domain->ocs at line 266 via
ocs_free(domain->ocs, sport, sizeof(*sport)).
My patch adds a new variable ocs and sets ocs =domain->ocs before domain can be
free, to avoid the uaf bug.
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