Re: Mounting corrupted HFS+ causes kernel NULL pointer dereference

[Anatoly Trosinenko]

Thank you,

When applied this single patch on v4.18-rc4 and performed "echo >
/mnt/xyz" on hfsplus_16mb_hang image, I get about 14 pairs of lines

hfsplus: unable to mark blocks free: error -5
hfsplus: can't free extent

Then `echo` exits with "No space left on device" error. Then it
permits to perform `rm /mnt/xyz` and on `echo > /mnt/1` it responds
with no space left on device (but file *is* created and is cattable).
I don't know what is safer, but now it doesn't deadlock. :) Maybe it
is even worth to remount FS r/o, I don't know. (Please excuse me for
speculations)

Thanks,
Anatoly

ÐÐ, 9 ÐÑÐ. 2018 Ð. Ð 23:35, Ernesto A. FernÃndez
<ernesto.mnd.fernandez@xxxxxxxxx>:
>
> On Tue, Jun 12, 2018 at 09:43:26PM +0300, Anatoly Trosinenko wrote:
> > And when I mount hfsplus_16mb_hang and perform `echo > /mnt/xyz`, it hangs.
>
> I just sent you a patch for this final report. Let me know if it works
> for you.