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[v2,2/6] bna: ensure the copied buf is NUL terminated

Message ID 20240424-fix-oob-read-v2-2-f1f1b53a10f4@gmail.com (mailing list archive)
State Accepted
Headers show
Series Ensure the copied buf is NUL terminated | expand

Commit Message

Bui Quang Minh April 24, 2024, 2:44 p.m. UTC 
Currently, we allocate a nbytes-sized kernel buffer and copy nbytes 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: 7afc5dbde091 ("bna: Add debugfs interface.")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
---
 drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
index 7246e13dd559..97291bfbeea5 100644
--- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
@@ -312,7 +312,7 @@  bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
 	void *kern_buf;
 
 	/* Copy the user space buf */
-	kern_buf = memdup_user(buf, nbytes);
+	kern_buf = memdup_user_nul(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);
 
@@ -372,7 +372,7 @@  bnad_debugfs_write_regwr(struct file *file, const char __user *buf,
 	void *kern_buf;
 
 	/* Copy the user space buf */
-	kern_buf = memdup_user(buf, nbytes);
+	kern_buf = memdup_user_nul(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);