From aa4a829bdaced81e70c215a84ef6595ce8bd4308 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sat, 8 Apr 2017 10:02:46 +0800 Subject: [PATCH] crypto: xts - Fix use-after-free on EINPROGRESS When we get an EINPROGRESS completion in xts, we will end up marking the request as done and freeing it. This then blows up when the request is really completed as we've already freed the memory. Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher") Cc: Reported-by: Nathan Royce Reported-by: Krzysztof Kozlowski Signed-off-by: Herbert Xu Tested-by: Krzysztof Kozlowski --- crypto/xts.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/crypto/xts.c b/crypto/xts.c index c976bfac29da..89ace5ebc2da 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -286,6 +286,13 @@ static void encrypt_done(struct crypto_async_request *areq, int err) struct rctx *rctx; rctx = skcipher_request_ctx(req); + + if (err == -EINPROGRESS) { + if (rctx->left != req->cryptlen) + return; + goto out; + } + subreq = &rctx->subreq; subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; @@ -293,6 +300,7 @@ static void encrypt_done(struct crypto_async_request *areq, int err) if (rctx->left) return; +out: skcipher_request_complete(req, err); } @@ -330,6 +338,13 @@ static void decrypt_done(struct crypto_async_request *areq, int err) struct rctx *rctx; rctx = skcipher_request_ctx(req); + + if (err == -EINPROGRESS) { + if (rctx->left != req->cryptlen) + return; + goto out; + } + subreq = &rctx->subreq; subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; @@ -337,6 +352,7 @@ static void decrypt_done(struct crypto_async_request *areq, int err) if (rctx->left) return; +out: skcipher_request_complete(req, err); }