[ath:ath12k-mlo-qcn9274 64/81] drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15

[Dan Carpenter]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git ath12k-mlo-qcn9274
head:   7435d14d41d5d479a5e6a8a2cd4efdac9d928823
commit: 8e3d460d4c16e52a70ebfa7e1dd0bd20bf739888 [64/81] wifi: ath12k: Use mac80211 vif's link conf instead of bss_conf
config: csky-randconfig-r072-20241008 (https://download.01.org/0day-ci/archive/20241009/202410090633.yjfmlMkr-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/202410090633.yjfmlMkr-lkp@intel.com/

New smatch warnings:
drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15
drivers/net/wireless/ath/ath12k/mac.c:517 ath12k_get_link_bss_conf() error: buffer overflow 'vif->link_conf' 15 <= 15

vim +517 drivers/net/wireless/ath/ath12k/mac.c

8e3d460d4c16e5 Sriram R   2024-08-16  507  struct ieee80211_bss_conf *ath12k_get_link_bss_conf(struct ath12k_link_vif *arvif)
8e3d460d4c16e5 Sriram R   2024-08-16  508  {
8e3d460d4c16e5 Sriram R   2024-08-16  509  	struct ieee80211_vif *vif = arvif->ahvif->vif;
8e3d460d4c16e5 Sriram R   2024-08-16  510  	struct ieee80211_bss_conf *link_conf;
8e3d460d4c16e5 Sriram R   2024-08-16  511  	/* ieee80211_vif->link_conf[]s are rcu objects which requires rcu_read_lock()
8e3d460d4c16e5 Sriram R   2024-08-16  512  	 * to be held for safe access.
8e3d460d4c16e5 Sriram R   2024-08-16  513  	 */
8e3d460d4c16e5 Sriram R   2024-08-16  514  	if (arvif->link_id > IEEE80211_MLD_MAX_NUM_LINKS)

Seems like this is an off by one.

8e3d460d4c16e5 Sriram R   2024-08-16  515  		return NULL;
8e3d460d4c16e5 Sriram R   2024-08-16  516  	rcu_read_lock();
8e3d460d4c16e5 Sriram R   2024-08-16 @517  	link_conf = rcu_dereference(vif->link_conf[arvif->link_id]);
8e3d460d4c16e5 Sriram R   2024-08-16  518  	rcu_read_unlock();
8e3d460d4c16e5 Sriram R   2024-08-16  519  	return link_conf;
8e3d460d4c16e5 Sriram R   2024-08-16  520  }

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