[PATCH 6.8 043/336] ice: ensure the copied buf is NUL terminated

Greg Kroah-Hartman
2024-05-14T10:28:33Z

From: Bui Quang Minh <minhquangbui99@gmail.com>

[ Upstream commit 666854ea9cad844f75a068f32812a2d78004914a ]

Currently, we allocate a count-sized kernel buffer and copy count bytes
from userspace to that buffer. Later, we use sscanf on this buffer but we
don't ensure that the string is terminated inside the buffer, this can lead
to OOB read when using sscanf. Fix this issue by using memdup_user_nul
instead of memdup_user.

Fixes: 96a9a9341cda ("ice: configure FW logging")
Fixes: 73671c3162c8 ("ice: enable FW logging")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-1-f1f1b53a10f4@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/ice/ice_debugfs.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_debugfs.c b/drivers/net/ethernet/intel/ice/ice_debugfs.c
index c2bfba6b9ead6..66aa9759c8e7e 100644
--- a/drivers/net/ethernet/intel/ice/ice_debugfs.c
+++ b/drivers/net/ethernet/intel/ice/ice_debugfs.c
@@ -174,7 +174,7 @@ ice_debugfs_module_write(struct file *filp, const char __user *buf,
if (*ppos != 0 || count > 8)
return -EINVAL;

- cmd_buf = memdup_user(buf, count);
+ cmd_buf = memdup_user_nul(buf, count);
if (IS_ERR(cmd_buf))
return PTR_ERR(cmd_buf);

@@ -260,7 +260,7 @@ ice_debugfs_nr_messages_write(struct file *filp, const char __user *buf,
if (*ppos != 0 || count > 4)
return -EINVAL;

- cmd_buf = memdup_user(buf, count);
+ cmd_buf = memdup_user_nul(buf, count);
if (IS_ERR(cmd_buf))
return PTR_ERR(cmd_buf);

@@ -335,7 +335,7 @@ ice_debugfs_enable_write(struct file *filp, const char __user *buf,
if (*ppos != 0 || count > 2)
return -EINVAL;

- cmd_buf = memdup_user(buf, count);
+ cmd_buf = memdup_user_nul(buf, count);
if (IS_ERR(cmd_buf))
return PTR_ERR(cmd_buf);

@@ -431,7 +431,7 @@ ice_debugfs_log_size_write(struct file *filp, const char __user *buf,
if (*ppos != 0 || count > 5)
return -EINVAL;

- cmd_buf = memdup_user(buf, count);
+ cmd_buf = memdup_user_nul(buf, count);
if (IS_ERR(cmd_buf))
return PTR_ERR(cmd_buf);

--
2.43.0