In the Linux kernel, the following vulnerability has been resolved:fsdax: Fix infinite loop in dax_iomap_rw()I got an infinite loop and a WARNING report when executing a tail commandin virtiofs.  WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0  Modules linked in:  CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7  Call Trace:  <TASK>  dax_iomap_rw+0xea/0x620  ? __this_cpu_preempt_check+0x13/0x20  fuse_dax_read_iter+0x47/0x80  fuse_file_read_iter+0xae/0xd0  new_sync_read+0xfe/0x180  ? 0xffffffff81000000  vfs_read+0x14d/0x1a0  ksys_read+0x6d/0xf0  __x64_sys_read+0x1a/0x20  do_syscall_64+0x3b/0x90  entry_SYSCALL_64_after_hwframe+0x63/0xcdThe tail command will call read() with a count of 0. In this case,iomap_iter() will report this WARNING, and always return 1 which casuingthe infinite loop in dax_iomap_rw().Fixing by checking count whether is 0 in dax_iomap_rw().
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')