From 563e609275927c0b75fbfd0d90441543aa7b5e0d Mon Sep 17 00:00:00 2001 From: Bui Quang Minh Date: Wed, 24 Apr 2024 21:44:21 +0700 Subject: [PATCH] scsi: qedf: Ensure the copied buf is NUL terminated [ Upstream commit d0184a375ee797eb657d74861ba0935b6e405c62 ] Currently, we allocate a count-sized kernel buffer and copy count from userspace to that buffer. Later, we use kstrtouint on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using kstrtouint. Fix this issue by using memdup_user_nul instead of memdup_user. Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.") Signed-off-by: Bui Quang Minh Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-4-f1f1b53a10f4@gmail.com Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/qedf/qedf_debugfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/qedf/qedf_debugfs.c b/drivers/scsi/qedf/qedf_debugfs.c index 451fd236bfd0..96174353e389 100644 --- a/drivers/scsi/qedf/qedf_debugfs.c +++ b/drivers/scsi/qedf/qedf_debugfs.c @@ -170,7 +170,7 @@ qedf_dbg_debug_cmd_write(struct file *filp, const char __user *buffer, if (!count || *ppos) return 0; - kern_buf = memdup_user(buffer, count); + kern_buf = memdup_user_nul(buffer, count); if (IS_ERR(kern_buf)) return PTR_ERR(kern_buf);