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CVE-2022-4128: mptcp: fix subflow traversal at disconnect time · torvalds/linux@5c835bb
A NULL pointer dereference issue was discovered in the Linux kernel in the MPTCP protocol when traversing the subflow list at disconnect time. A local user could use this flaw to potentially crash the system causing a denial of service.
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mptcp: fix subflow traversal at disconnect time
At disconnect time the MPTCP protocol traverse the subflows list closing each of them. In some circumstances - MPJ subflow, passive MPTCP socket, the latter operation can remove the subflow from the list, invalidating the current iterator.
Address the issue using the safe list traversing helper variant.
Reported-by: van fantasy [email protected] Fixes: b29fcfb (“mptcp: full disconnect implementation”) Tested-by: Matthieu Baerts [email protected] Reviewed-by: Mat Martineau [email protected] Signed-off-by: Paolo Abeni [email protected] Signed-off-by: Mat Martineau [email protected] Signed-off-by: David S. Miller [email protected]
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