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thunderbolt: fix memory leak of object sw 

In the case where the call tb_switch_exceeds_max_depth is true
the error reurn path leaks memory in sw.  Fix this by setting
the return error code to -EADDRNOTAVAIL and returning via the
error exit path err_free_sw_ports to free sw. sw has been kzalloc'd
so the free of the NULL sw->ports is fine.

Addresses-Coverity: ("Resource leak")
Fixes: b04079837b ("thunderbolt: Add initial support for USB4")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20191220220526.11307-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2019-12-20 22:05:26 +00:00 committed by Greg Kroah-Hartman
parent 845f081002
commit 704a940d55
1 changed files with 4 additions and 2 deletions
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6
drivers/thunderbolt/switch.c
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@ -1885,8 +1885,10 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
sw->config.enabled = 0;
/* Make sure we do not exceed maximum topology limit */
if (tb_switch_exceeds_max_depth(sw, depth))
return ERR_PTR(-EADDRNOTAVAIL);
if (tb_switch_exceeds_max_depth(sw, depth)) {
ret = -EADDRNOTAVAIL;
goto err_free_sw_ports;
}
/* initialize ports */
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),