From: Jan Kara <jack@suse.cz> stable inclusion from stable-5.10.79 commit 86d4aedcbc69c0f84551fb70f953c24e396de2d7 bugzilla: 185793 https://gitee.com/openeuler/kernel/issues/I4K65C Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit e96a1866b40570b5950cda8602c2819189c62a48 upstream. When isofs image is suitably corrupted isofs_read_inode() can read data beyond the end of buffer. Sanity-check the directory entry length before using it. Reported-and-tested-by: syzbot+6fc7fb214625d82af7d1@syzkaller.appspotmail.com CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Bin Li <huawei.libin@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- fs/isofs/inode.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index 35675a1065be..f62b5a501566 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -1321,6 +1321,8 @@ static int isofs_read_inode(struct inode *inode, int relocated) de = (struct iso_directory_record *) (bh->b_data + offset); de_len = *(unsigned char *) de; + if (de_len < sizeof(struct iso_directory_record)) + goto fail; if (offset + de_len > bufsize) { int frag1 = bufsize - offset; -- 2.20.1