From: Dan Carpenter <dan.carpenter@linaro.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH next v2] nvdimm: Prevent integer overflow in ramdax_get_config_data()
Date: Wed, 26 Nov 2025 15:11:53 +0300 [thread overview]
Message-ID: <aSbuiYCznEIZDa02@stanley.mountain> (raw)
The "cmd->in_offset" variable comes from the user via the __nd_ioctl()
function. The problem is that the "cmd->in_offset + cmd->in_length"
addition could have an integer wrapping issue if cmd->in_offset is close
to UINT_MAX . Both "cmd->in_offset" and "cmd->in_length" are u32
variables.
Fixes: 43bc0aa19a21 ("nvdimm: allow exposing RAM carveouts as NVDIMM DIMM devices")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
v2: Ira Weiny pointed out that ramdax_set_config_data() needs to be
fixed as well.
drivers/nvdimm/ramdax.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/nvdimm/ramdax.c b/drivers/nvdimm/ramdax.c
index 63cf05791829..954cb7919807 100644
--- a/drivers/nvdimm/ramdax.c
+++ b/drivers/nvdimm/ramdax.c
@@ -143,7 +143,7 @@ static int ramdax_get_config_data(struct nvdimm *nvdimm, int buf_len,
return -EINVAL;
if (struct_size(cmd, out_buf, cmd->in_length) > buf_len)
return -EINVAL;
- if (cmd->in_offset + cmd->in_length > LABEL_AREA_SIZE)
+ if (size_add(cmd->in_offset, cmd->in_length) > LABEL_AREA_SIZE)
return -EINVAL;
memcpy(cmd->out_buf, dimm->label_area + cmd->in_offset, cmd->in_length);
@@ -160,7 +160,7 @@ static int ramdax_set_config_data(struct nvdimm *nvdimm, int buf_len,
return -EINVAL;
if (struct_size(cmd, in_buf, cmd->in_length) > buf_len)
return -EINVAL;
- if (cmd->in_offset + cmd->in_length > LABEL_AREA_SIZE)
+ if (size_add(cmd->in_offset, cmd->in_length) > LABEL_AREA_SIZE)
return -EINVAL;
memcpy(dimm->label_area + cmd->in_offset, cmd->in_buf, cmd->in_length);
--
2.51.0
next reply other threads:[~2025-11-26 12:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-26 12:11 Dan Carpenter [this message]
2025-11-26 13:21 ` [PATCH next v2] nvdimm: Prevent integer overflow in ramdax_get_config_data() Mike Rapoport
2025-11-26 16:59 ` Ira Weiny
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