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thunderbolt: Fix to check for kmemdup failure 

Memory allocated via kmemdup might fail and return a NULL pointer.
This patch adds a check on the return value of kmemdup and passes the
error upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Aditya Pakki 2019-03-20 10:57:54 -05:00 committed by Mika Westerberg
parent e4dfdd5804
commit 2cc12751cf
1 changed files with 16 additions and 6 deletions
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22
drivers/thunderbolt/switch.c
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@ -1294,13 +1294,14 @@ int tb_switch_configure(struct tb_switch *sw)
return tb_plug_events_active(sw, true);
}
static void tb_switch_set_uuid(struct tb_switch *sw)
static int tb_switch_set_uuid(struct tb_switch *sw)
{
u32 uuid[4];
int cap;
int cap, ret;
ret = 0;
if (sw->uuid)
return;
return ret;
/*
* The newer controllers include fused UUID as part of link
@ -1308,7 +1309,9 @@ static void tb_switch_set_uuid(struct tb_switch *sw)
*/
cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
if (cap > 0) {
tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
ret = tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
if (ret)
return ret;
} else {
/*
* ICM generates UUID based on UID and fills the upper
@ -1323,6 +1326,9 @@ static void tb_switch_set_uuid(struct tb_switch *sw)
}
sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
if (!sw->uuid)
ret = -ENOMEM;
return ret;
}
static int tb_switch_add_dma_port(struct tb_switch *sw)
@ -1372,7 +1378,9 @@ static int tb_switch_add_dma_port(struct tb_switch *sw)
if (status) {
tb_sw_info(sw, "switch flash authentication failed\n");
tb_switch_set_uuid(sw);
ret = tb_switch_set_uuid(sw);
if (ret)
return ret;
nvm_set_auth_status(sw, status);
}
@ -1422,7 +1430,9 @@ int tb_switch_add(struct tb_switch *sw)
}
tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
tb_switch_set_uuid(sw);
ret = tb_switch_set_uuid(sw);
if (ret)
return ret;
for (i = 0; i <= sw->config.max_port_number; i++) {
if (sw->ports[i].disabled) {