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80df409e1a
mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst
with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, a use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.
Fixes:
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History
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| mtk_eth_path.c | ||
| mtk_eth_soc.c | ||
| mtk_eth_soc.h | ||
| mtk_ppe.c | ||
| mtk_ppe.h | ||
| mtk_ppe_debugfs.c | ||
| mtk_ppe_offload.c | ||
| mtk_ppe_regs.h | ||
| mtk_star_emac.c | ||
| mtk_wed.c | ||
| mtk_wed.h | ||
| mtk_wed_debugfs.c | ||
| mtk_wed_mcu.c | ||
| mtk_wed_ops.c | ||
| mtk_wed_regs.h | ||
| mtk_wed_wo.c | ||
| mtk_wed_wo.h | ||