The patch below does not apply to the 6.6-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 stable@vger.kernel.org.

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-6.6.y git checkout FETCH_HEAD git cherry-pick -x 8679e8b4a1ebdb40c4429e49368d29353e07b601 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024090921-cycling-overfed-49be@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

8679e8b4a1eb ("nvmem: u-boot-env: error if NVMEM device is too small") 6bafe07c9306 ("nvmem: u-boot-env: improve coding style") a832556d23c5 ("nvmem: u-boot-env: use nvmem device helpers")

thanks,

greg k-h

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

From 8679e8b4a1ebdb40c4429e49368d29353e07b601 Mon Sep 17 00:00:00 2001 From: John Thomson git@johnthomson.fastmail.com.au Date: Mon, 2 Sep 2024 15:25:08 +0100 Subject: [PATCH] nvmem: u-boot-env: error if NVMEM device is too small MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

Verify data size before trying to parse it to avoid reading out of buffer. This could happen in case of problems at MTD level or invalid DT bindings.

Signed-off-by: John Thomson git@johnthomson.fastmail.com.au Cc: stable stable@kernel.org Fixes: d5542923f200 ("nvmem: add driver handling U-Boot environment variables") [rmilecki: simplify commit description & rebase] Signed-off-by: Rafał Miłecki rafal@milecki.pl Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Link: https://lore.kernel.org/r/20240902142510.71096-2-srinivas.kandagatla@linaro.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/nvmem/u-boot-env.c b/drivers/nvmem/u-boot-env.c index 936e39b20b38..593f0bf4a395 100644 --- a/drivers/nvmem/u-boot-env.c +++ b/drivers/nvmem/u-boot-env.c @@ -176,6 +176,13 @@ static int u_boot_env_parse(struct u_boot_env *priv) data_offset = offsetof(struct u_boot_env_image_broadcom, data); break; } + + if (dev_size < data_offset) { + dev_err(dev, "Device too small for u-boot-env\n"); + err = -EIO; + goto err_kfree; + } + crc32_addr = (__le32 *)(buf + crc32_offset); crc32 = le32_to_cpu(*crc32_addr); crc32_data_len = dev_size - crc32_data_offset;