From fd6de099d7fabc2b86f51dc622453eb279f7cce9 Mon Sep 17 00:00:00 2001 From: Yang Yingliang Date: Mon, 31 May 2021 17:25:05 +0900 Subject: [PATCH] cifsd: check return value of ksmbd_vfs_getcasexattr() correctly If ksmbd_vfs_getcasexattr() returns -ENOMEM, stream_buf is NULL, it will cause null-ptr-deref when using it to copy memory. So we need check the return value of ksmbd_vfs_getcasexattr() by comparing with 0. Signed-off-by: Yang Yingliang Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/cifsd/vfs.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/fs/cifsd/vfs.c b/fs/cifsd/vfs.c index 8587241..56b1091 100644 --- a/fs/cifsd/vfs.c +++ b/fs/cifsd/vfs.c @@ -274,7 +274,6 @@ static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, { ssize_t v_len; char *stream_buf = NULL; - int err; ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", *pos, count); @@ -283,11 +282,8 @@ static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, fp->stream.name, fp->stream.size, &stream_buf); - if (v_len == -ENOENT) { - ksmbd_err("not found stream in xattr : %zd\n", v_len); - err = -ENOENT; - return err; - } + if ((int)v_len <= 0) + return (int)v_len; memcpy(buf, &stream_buf[*pos], count); kvfree(stream_buf); @@ -415,9 +411,9 @@ static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos, fp->stream.name, fp->stream.size, &stream_buf); - if (v_len == -ENOENT) { + if ((int)v_len < 0) { ksmbd_err("not found stream in xattr : %zd\n", v_len); - err = -ENOENT; + err = (int)v_len; goto out; } -- 2.7.4