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9e741045fa
Setting the refcount to 0 when allocating a tree to match the number of
switch devices it holds may cause an 'increment on 0; use-after-free',
if CONFIG_REFCOUNT_FULL is enabled.
To fix this, do not decrement the refcount of a newly allocated tree,
increment it when an already allocated tree is found, and decrement it
after the probing of a switch, as done with the previous behavior.
At the same time, make dsa_tree_get and dsa_tree_put accept a NULL
argument to simplify callers, and return the tree after incrementation,
as most kref users like of_node_get and of_node_put do.
Fixes:
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||
|---|---|---|
| .. | ||
| dsa2.c | ||
| dsa_priv.h | ||
| dsa.c | ||
| Kconfig | ||
| legacy.c | ||
| Makefile | ||
| master.c | ||
| port.c | ||
| slave.c | ||
| switch.c | ||
| tag_brcm.c | ||
| tag_dsa.c | ||
| tag_edsa.c | ||
| tag_ksz.c | ||
| tag_lan9303.c | ||
| tag_mtk.c | ||
| tag_qca.c | ||
| tag_trailer.c | ||