On Sat, Feb 05, 2022 at 02:39:06PM -0800, syzbot wrote: > syzbot has bisected this issue to: > > commit cebe85d570cf84804e848332d6721bc9e5300e07 > Author: Lukas Czerner <lczerner@xxxxxxxxxx> > Date: Wed Oct 27 14:18:56 2021 +0000 > > ext4: switch to the new mount api > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14902978700000 > start commit: 0457e5153e0e Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=16902978700000 > console output: https://syzkaller.appspot.com/x/log.txt?x=12902978700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cd57c0f940a9a1ec > dashboard link: https://syzkaller.appspot.com/bug?extid=138c9e58e3cb22eae3b4 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f7004fb00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=178cf108700000 > > Reported-by: syzbot+138c9e58e3cb22eae3b4@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: cebe85d570cf ("ext4: switch to the new mount api") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > I believe that this has been fixed with upstream commit commit 7c268d4ce2d3761f666a9950b029c8902bfab710 Author: Lukas Czerner <lczerner@xxxxxxxxxx> Date: Wed Jan 19 14:02:09 2022 +0100 ext4: fix potential NULL pointer dereference in ext4_fill_super() By mistake we fail to return an error from ext4_fill_super() in case that ext4_alloc_sbi() fails to allocate a new sbi. Instead we just set the ret variable and allow the function to continue which will later lead to a NULL pointer dereference. Fix it by returning -ENOMEM in the case ext4_alloc_sbi() fails. Fixes: cebe85d570cf ("ext4: switch to the new mount api") Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220119130209.40112-1-lczerner@xxxxxxxxxx Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Cc: stable@xxxxxxxxxx Thanks! -Lukas
