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net: nfc: llcp: Add lock when modifying device list

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The device list needs its associated lock held when modifying it, or the
list could become corrupted, as syzbot discovered.

Reported-and-tested-by: syzbot+c1d0a03d305972dbbe14@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c1d0a03d305972dbbe14
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Fixes: 6709d4b7bc ("net: nfc: Fix use-after-free caused by nfc_llcp_find_local")
Link: https://lore.kernel.org/r/20230908235853.1319596-1-jeremy@jcline.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeremy Cline 2023-09-08 19:58:53 -04:00 • committed by Jakub Kicinski
parent 8957261cd8
commit dfc7f7a988
1 changed files with 2 additions and 0 deletions
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2
net/nfc/llcp_core.c
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@ -1636,7 +1636,9 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
spin_lock(&llcp_devices_lock);
list_add(&local->list, &llcp_devices); list_add(&local->list, &llcp_devices);
spin_unlock(&llcp_devices_lock);
return 0; return 0;
} }