btrfs: send: limit number of clones and allocated memory size

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The arg->clone_sources_count is u64 and can trigger a warning when a
huge value is passed from user space and a huge array is allocated.
Limit the allocated memory to 8MiB (can be increased if needed), which
in turn limits the number of clone sources to 8M / sizeof(struct
clone_root) = 8M / 40 = 209715.  Real world number of clones is from
tens to hundreds, so this is future proof.

Reported-by: syzbot+4376a9a073770c173269@syzkaller.appspotmail.com
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2023-01-24 20:32:10 +01:00

parent eadd7deca0

commit 33e17b3f5a

1 changed files with 3 additions and 3 deletions

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fs/btrfs/send.c

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