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| author | Ping-Ke Shih <pkshih@realtek.com> | 2023-02-03 10:36:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 16:45:42 +0000 |
| commit | 1571120c44dbe5757aee1612c5b6097cdc42710f (patch) | |
| tree | f1a21f63d238982928feef813c41855dc48612fb /net | |
| parent | a522bd07f94f264ad39acddaf58124631f466232 (diff) | |
| download | linux-1571120c44dbe5757aee1612c5b6097cdc42710f.tar.gz linux-1571120c44dbe5757aee1612c5b6097cdc42710f.tar.bz2 linux-1571120c44dbe5757aee1612c5b6097cdc42710f.zip | |
wifi: mac80211: don't return unset power in ieee80211_get_tx_power()
[ Upstream commit e160ab85166e77347d0cbe5149045cb25e83937f ]
We can get a UBSAN warning if ieee80211_get_tx_power() returns the
INT_MIN value mac80211 internally uses for "unset power level".
UBSAN: signed-integer-overflow in net/wireless/nl80211.c:3816:5
-2147483648 * 100 cannot be represented in type 'int'
CPU: 0 PID: 20433 Comm: insmod Tainted: G WC OE
Call Trace:
dump_stack+0x74/0x92
ubsan_epilogue+0x9/0x50
handle_overflow+0x8d/0xd0
__ubsan_handle_mul_overflow+0xe/0x10
nl80211_send_iface+0x688/0x6b0 [cfg80211]
[...]
cfg80211_register_wdev+0x78/0xb0 [cfg80211]
cfg80211_netdev_notifier_call+0x200/0x620 [cfg80211]
[...]
ieee80211_if_add+0x60e/0x8f0 [mac80211]
ieee80211_register_hw+0xda5/0x1170 [mac80211]
In this case, simply return an error instead, to indicate
that no data is available.
Cc: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20230203023636.4418-1-pkshih@realtek.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/cfg.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 94293b57f1b2..05e74004376f 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2428,6 +2428,10 @@ static int ieee80211_get_tx_power(struct wiphy *wiphy, else *dbm = sdata->vif.bss_conf.txpower; + /* INT_MIN indicates no power level was set yet */ + if (*dbm == INT_MIN) + return -EINVAL; + return 0; } |