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net: dsa: bcm_sf2: Fix overflow checks 

Commit f949a12fd6 ("net: dsa: bcm_sf2: fix buffer overflow doing
set_rxnfc") tried to fix the some user controlled buffer overflows in
bcm_sf2_cfp_rule_set() and bcm_sf2_cfp_rule_del() but the fix was using
CFP_NUM_RULES, which while it is correct not to overflow the bitmaps, is
not representative of what the device actually supports. Correct that by
using bcm_sf2_cfp_rule_size() instead.

The latter subtracts the number of rules by 1, so change the checks from
greater than or equal to greater than accordingly.

Fixes: f949a12fd6 ("net: dsa: bcm_sf2: fix buffer overflow doing set_rxnfc")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2020-03-30 14:38:46 -07:00 committed by David S. Miller
parent ed52f2c608
commit d0802dc411
1 changed files with 3 additions and 6 deletions
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9
drivers/net/dsa/bcm_sf2_cfp.c
View File

@ -882,17 +882,14 @@ static int bcm_sf2_cfp_rule_set(struct dsa_switch *ds, int port,
fs->m_ext.data[1]))
return -EINVAL;
if (fs->location != RX_CLS_LOC_ANY && fs->location >= CFP_NUM_RULES)
if (fs->location != RX_CLS_LOC_ANY &&
fs->location > bcm_sf2_cfp_rule_size(priv))
return -EINVAL;
if (fs->location != RX_CLS_LOC_ANY &&
test_bit(fs->location, priv->cfp.used))
return -EBUSY;
if (fs->location != RX_CLS_LOC_ANY &&
fs->location > bcm_sf2_cfp_rule_size(priv))
return -EINVAL;
ret = bcm_sf2_cfp_rule_cmp(priv, port, fs);
if (ret == 0)
return -EEXIST;
@ -973,7 +970,7 @@ static int bcm_sf2_cfp_rule_del(struct bcm_sf2_priv *priv, int port, u32 loc)
struct cfp_rule *rule;
int ret;
if (loc >= CFP_NUM_RULES)
if (loc > bcm_sf2_cfp_rule_size(priv))
return -EINVAL;
/* Refuse deleting unused rules, and those that are not unique since