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net: stmmac: fix out-of-bounds access in a selftest 

GCC 12 points out that struct tc_action is smaller than
struct tcf_action:

drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c: In function ‘stmmac_test_rxp’:
drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:1132:21: warning: array subscript ‘struct tcf_gact[0]’ is partly outside array bounds of ‘unsigned char[272]’ [-Warray-bounds]
 1132 |                 gact->tcf_action = TC_ACT_SHOT;
      |                     ^~

Fixes: ccfc639a94 ("net: stmmac: selftests: Add a selftest for Flexible RX Parser")
Link: https://lore.kernel.org/r/20220519004305.2109708-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-05-18 17:43:05 -07:00
parent 9b80ccda23
commit fe5c5fc145
1 changed files with 6 additions and 7 deletions
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13
drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
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@ -1084,8 +1084,9 @@ static int stmmac_test_rxp(struct stmmac_priv *priv)
unsigned char addr[ETH_ALEN] = {0xde, 0xad, 0xbe, 0xef, 0x00, 0x00};
struct tc_cls_u32_offload cls_u32 = { };
struct stmmac_packet_attrs attr = { };
struct tc_action **actions, *act;
struct tc_action **actions;
struct tc_u32_sel *sel;
struct tcf_gact *gact;
struct tcf_exts *exts;
int ret, i, nk = 1;
@ -1110,8 +1111,8 @@ static int stmmac_test_rxp(struct stmmac_priv *priv)
goto cleanup_exts;
}
act = kcalloc(nk, sizeof(*act), GFP_KERNEL);
if (!act) {
gact = kcalloc(nk, sizeof(*gact), GFP_KERNEL);
if (!gact) {
ret = -ENOMEM;
goto cleanup_actions;
}
@ -1126,9 +1127,7 @@ static int stmmac_test_rxp(struct stmmac_priv *priv)
exts->nr_actions = nk;
exts->actions = actions;
for (i = 0; i < nk; i++) {
struct tcf_gact *gact = to_gact(&act[i]);
actions[i] = &act[i];
actions[i] = (struct tc_action *)&gact[i];
gact->tcf_action = TC_ACT_SHOT;
}
@ -1152,7 +1151,7 @@ static int stmmac_test_rxp(struct stmmac_priv *priv)
stmmac_tc_setup_cls_u32(priv, priv, &cls_u32);
cleanup_act:
kfree(act);
kfree(gact);
cleanup_actions:
kfree(actions);
cleanup_exts: