Patch "net: tls: fix use-after-free with partial reads and async decrypt" has been added to the 6.6-stable tree

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

    net: tls: fix use-after-free with partial reads and async decrypt

to the 6.6-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:
     net-tls-fix-use-after-free-with-partial-reads-and-as.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit bb2489d2136b70298909a60a58603f6b7b6684fd
Author: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Date:   Tue Feb 6 17:18:22 2024 -0800

    net: tls: fix use-after-free with partial reads and async decrypt
    
    [ Upstream commit 32b55c5ff9103b8508c1e04bfa5a08c64e7a925f ]
    
    tls_decrypt_sg doesn't take a reference on the pages from clear_skb,
    so the put_page() in tls_decrypt_done releases them, and we trigger
    a use-after-free in process_rx_list when we try to read from the
    partially-read skb.
    
    Fixes: fd31f3996af2 ("tls: rx: decrypt into a fresh skb")
    Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index c32fce6f3563..2af8b0873da6 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -63,6 +63,7 @@ struct tls_decrypt_ctx {
 	u8 iv[MAX_IV_SIZE];
 	u8 aad[TLS_MAX_AAD_SIZE];
 	u8 tail;
+	bool free_sgout;
 	struct scatterlist sg[];
 };
 
@@ -187,7 +188,6 @@ static void tls_decrypt_done(void *data, int err)
 	struct aead_request *aead_req = data;
 	struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 	struct scatterlist *sgout = aead_req->dst;
-	struct scatterlist *sgin = aead_req->src;
 	struct tls_sw_context_rx *ctx;
 	struct tls_decrypt_ctx *dctx;
 	struct tls_context *tls_ctx;
@@ -224,7 +224,7 @@ static void tls_decrypt_done(void *data, int err)
 	}
 
 	/* Free the destination pages if skb was not decrypted inplace */
-	if (sgout != sgin) {
+	if (dctx->free_sgout) {
 		/* Skip the first S/G entry as it points to AAD */
 		for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
 			if (!sg)
@@ -1583,6 +1583,7 @@ static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov,
 	} else if (out_sg) {
 		memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
 	}
+	dctx->free_sgout = !!pages;
 
 	/* Prepare and submit AEAD request */
 	err = tls_do_decryption(sk, sgin, sgout, dctx->iv,




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