This is a note to let you know that I've just added the patch titled crypto: asymmetric_keys - handle EBUSY due to backlog correctly to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: crypto-asymmetric_keys-handle-ebusy-due-to-backlog-correctly.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From e68368aed56324e2e38d4f6b044bb8cf82077fc2 Mon Sep 17 00:00:00 2001 From: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> Date: Thu, 18 May 2017 16:29:23 +0300 Subject: crypto: asymmetric_keys - handle EBUSY due to backlog correctly From: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> commit e68368aed56324e2e38d4f6b044bb8cf82077fc2 upstream. public_key_verify_signature() was passing the CRYPTO_TFM_REQ_MAY_BACKLOG flag to akcipher_request_set_callback() but was not handling correctly the case where a -EBUSY error could be returned from the call to crypto_akcipher_verify() if backlog was used, possibly casuing data corruption due to use-after-free of buffers. Resolve this by handling -EBUSY correctly. Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- crypto/asymmetric_keys/public_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -140,7 +140,7 @@ int public_key_verify_signature(const st * signature and returns that to us. */ ret = crypto_akcipher_verify(req); - if (ret == -EINPROGRESS) { + if ((ret == -EINPROGRESS) || (ret == -EBUSY)) { wait_for_completion(&compl.completion); ret = compl.err; } Patches currently in stable-queue which might be from gilad@xxxxxxxxxxxxx are queue-4.9/crypto-drbg-wait-for-crypto-op-not-signal-safe.patch queue-4.9/crypto-gcm-wait-for-crypto-op-not-signal-safe.patch queue-4.9/crypto-asymmetric_keys-handle-ebusy-due-to-backlog-correctly.patch