[ath:ath12k-mlo-qcn9274 65/81] drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15

[Dan Carpenter]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git ath12k-mlo-qcn9274
head:   7435d14d41d5d479a5e6a8a2cd4efdac9d928823
commit: d50d85ea8574956b273faf4cb2493a98c6548b04 [65/81] wifi: ath12k: Use mac80211 sta's link_sta instead of deflink
config: csky-randconfig-r072-20241008 (https://download.01.org/0day-ci/archive/20241009/202410091157.eMoYClhc-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 14.1.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
| Closes: https://lore.kernel.org/r/202410091157.eMoYClhc-lkp@intel.com/

New smatch warnings:
drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:534 ath12k_get_link_sta() error: buffer overflow 'sta->link' 15 <= 15

vim +534 drivers/net/wireless/ath/ath12k/mac.c

d50d85ea857495 Sriram R 2024-08-16  522  static struct
d50d85ea857495 Sriram R 2024-08-16  523  ieee80211_link_sta *ath12k_get_link_sta(struct ath12k_link_sta *arsta)
d50d85ea857495 Sriram R 2024-08-16  524  {
d50d85ea857495 Sriram R 2024-08-16  525  	struct ath12k_sta *ahsta = arsta->ahsta;
d50d85ea857495 Sriram R 2024-08-16  526  	struct ieee80211_sta *sta = ath12k_ahsta_to_sta(ahsta);
d50d85ea857495 Sriram R 2024-08-16  527  	struct ieee80211_link_sta *link_sta;
d50d85ea857495 Sriram R 2024-08-16  528  	/* ieee80211_sta->link[]'s are rcu objects which requires rcu_read_lock()
d50d85ea857495 Sriram R 2024-08-16  529  	 * to be held for safe access.
d50d85ea857495 Sriram R 2024-08-16  530  	 */
d50d85ea857495 Sriram R 2024-08-16  531  	if (arsta->link_id > IEEE80211_MLD_MAX_NUM_LINKS)

Was >= intended?

d50d85ea857495 Sriram R 2024-08-16  532  		return NULL;
d50d85ea857495 Sriram R 2024-08-16  533  	rcu_read_lock();
d50d85ea857495 Sriram R 2024-08-16 @534  	link_sta = rcu_dereference(sta->link[arsta->link_id]);
d50d85ea857495 Sriram R 2024-08-16  535  	rcu_read_unlock();
d50d85ea857495 Sriram R 2024-08-16  536  	return link_sta;
d50d85ea857495 Sriram R 2024-08-16  537  }

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