From: Bui Quang Minh minhquangbui99@gmail.com

mainline inclusion from mainline-v6.9-rc7 commit 8c34096c7fdf272fd4c0c37fe411cd2e3ed0ee9f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9U1KE CVE: CVE-2024-36934

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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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 Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-2-f1f1b53a10f4@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Zhang Zekun zhangzekun11@huawei.com --- drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c index 04ad0f2b9677..777f0d7e4819 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);