[SECURITY] xfrm: xfrm_policy: fix double put in policy expansion (CVE-2022-36879)#130
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Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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[SECURITY] xfrm: xfrm_policy: fix double put in policy expansion (CVE-2022-36879)#130Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
Mifacopy wants to merge 1 commit intofacebookincubator:oculus-go-kernel-masterfrom
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Fix CVE-2022-36879.
Upstream commit: f85daf0e725358be78dfd208dea5fd665d8cb901
xfrm_expand_policies() may drop policy references in its error paths without
resetting the policy count, so callers may subsequently call xfrm_pols_put()
again and drop the same reference twice. This can lead to double free / kernel
crash (DoS).
Ensure *num_pols is set to 0 on error paths so callers do not double-release.
Reference: CVE-2022-36879