Bug 200085

Summary:	btrfs-progs: Infinite loop in btrfs receive --dump.
Product:	File System	Reporter:	Adam Buchbinder (adam.buchbinder)
Component:	btrfs	Assignee:	BTRFS virtual assignee (fs_btrfs)
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	alexander198961, dsterba, jackysen422
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	4.9.0	Subsystem:
Regression:	No	Bisected commit-id:

Description Adam Buchbinder 2018-06-15 20:09:34 UTC

Execute the following on git HEAD:

printf 'btrfs-stream\0\0\0\0\0' | btrfs receive --dump

It looks like btrfs receive hits an infinite loop because it tries to read a token, fails without advancing the read pointer, then tries to read a token again, etc.

This bug was found using american fuzzy lop.

Comment 1 Oleksandr 2018-10-15 13:05:25 UTC

Created https://github.com/kdave/btrfs-progs/pull/151 and passed max_error_count to function

Comment 2 Oleksandr 2018-11-18 12:16:58 UTC

Is it possible to fix this issue as set up max retry count (for avoid infinity loop)? as I did in
https://github.com/kdave/btrfs-progs/pull/151/files

Comment 3 David Sterba 2019-05-15 14:48:54 UTC

Your fix is correct and has been merged to btrfs-progs. Thanks you both.

Comment 4 jacky 2019-10-08 14:55:03 UTC

why have you changed the topic? It was correct, the kernel loads only with noapic or noacpi. The problem is DSDT/SSDT tables can not load because of ALREADY_EXIST problem. They should be fixed by someone correctly. We provide the best window repairs & https://yorconstruction.com/window-installation/
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