FAILED: patch "[PATCH] crypto: atmel-sha204a - Fix OOM ->tfm_count leak" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x d240b079a37e90af03fd7dfec94930eb6c83936e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026031702-level-vision-656b@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d240b079a37e90af03fd7dfec94930eb6c83936e Mon Sep 17 00:00:00 2001
From: Thorsten Blum <[email protected]>
Date: Thu, 19 Feb 2026 00:54:00 +0100
Subject: [PATCH] crypto: atmel-sha204a - Fix OOM ->tfm_count leak

If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.

index 8adc7fe71c04..98d1023007e3 100644
@@ -52,9 +52,10 @@ static int atmel_sha204a_rng_read_nonblocking(struct hwrng *rng, void *data,
 		rng->priv = 0;
 	} else {
 		work_data = kmalloc_obj(*work_data, GFP_ATOMIC);
-		if (!work_data)
+		if (!work_data) {
+			atomic_dec(&i2c_priv->tfm_count);
 			return -ENOMEM;
-
+		}
 		work_data->ctx = i2c_priv;
 		work_data->client = i2c_priv->client;
 

From: Thorsten Blum <[email protected]>

[ Upstream commit d240b079a37e90af03fd7dfec94930eb6c83936e ]

If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.

---
 drivers/crypto/atmel-sha204a.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

index 0ef92109ce22a..64d5ba13f4baf 100644
@@ -52,9 +52,10 @@ static int atmel_sha204a_rng_read_nonblocking(struct hwrng *rng, void *data,
 		rng->priv = 0;
 	} else {
 		work_data = kmalloc(sizeof(*work_data), GFP_ATOMIC);
-		if (!work_data)
+		if (!work_data) {
+			atomic_dec(&i2c_priv->tfm_count);
 			return -ENOMEM;
-
+		}
 		work_data->ctx = i2c_priv;
 		work_data->client = i2c_priv->client;
 

2.51.0