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Yong Wang
9406f6012b
ife decode may return after making only the outer IFE header and
metadata pullable. The caller then passes the decapsulated packet to
eth_type_trans(), which expects the inner Ethernet header to be
accessible from the linear data area.
With a malformed IFE frame, the inner Ethernet header may still be
shorter than ETH_HLEN in the linear area, which can lead to a crash in
the original code.
Fix this by extending the pull check in ife_decode() so that the inner
Ethernet header is also guaranteed to be pullable before returning.
Fixes: ef6980b6be ("introduce IFE action")
Cc: [email protected]
Reported-by: Yuan Tan <[email protected]>
Reported-by: Xin Liu <[email protected]>
Signed-off-by: Yong Wang <[email protected]>
Signed-off-by: Ren Wei <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>