Patch "staging: ccree: NULLify backup_info when unused" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

staging: ccree: NULLify backup_info when unused

to the 4.15-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:
staging-ccree-nullify-backup_info-when-unused.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Gilad Ben-Yossef <[email protected]>
Date: Sun, 3 Dec 2017 13:58:19 +0000
Subject: staging: ccree: NULLify backup_info when unused

From: Gilad Ben-Yossef <[email protected]>

commit 46df8824982e4fb0198776078d4a8c3e2d531464 upstream.

backup_info field is only allocated for decrypt code path. The field was not nullified when not used causing a kfree in an error handling path to attempt to free random addresses as uncovered in stress testing.

---
 drivers/staging/ccree/ssi_cipher.c |    1 +
 1 file changed, 1 insertion(+)

@@ -908,6 +908,7 @@ static int ssi_ablkcipher_decrypt(struct
 	scatterwalk_map_and_copy(req_ctx->backup_info, req->src,
 				 (req->nbytes - ivsize), ivsize, 0);
 	req_ctx->is_giv = false;
+	req_ctx->backup_info = NULL;
 
 	return ssi_blkcipher_process(tfm, req_ctx, req->dst, req->src, req->nbytes, req->info, ivsize, (void *)req, DRV_CRYPTO_DIRECTION_DECRYPT);
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/staging-ccree-fix-fips-event-irq-handling-build.patch queue-4.15/staging-ccree-nullify-backup_info-when-unused.patch