6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jeremy Kerr jk@codeconstruct.com.au
[ Upstream commit 9990889be14288d4f1743e4768222d5032a79c27 ]
We may hold an extra reference on a socket if a tag allocation fails: we optimistically allocate the sk_key, and take a ref there, but do not drop if we end up not using the allocated key.
Ensure we're dropping the sock on this failure by doing a proper unref rather than directly kfree()ing.
Fixes: de8a6b15d965 ("net: mctp: add an explicit reference from a mctp_sk_key to sock") Signed-off-by: Jeremy Kerr jk@codeconstruct.com.au Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/ce9b61e44d1cdae7797be0c5e3141baf582d23a0.170798348... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/mctp/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mctp/route.c b/net/mctp/route.c index 7a47a58aa54b4..6218dcd07e184 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -663,7 +663,7 @@ struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk, spin_unlock_irqrestore(&mns->keys_lock, flags);
if (!tagbits) { - kfree(key); + mctp_key_unref(key); return ERR_PTR(-EBUSY); }