bcachefs: Fix sb_field_downgrade validation

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- bch2_sb_downgrade_validate() wasn't checking for a downgrade entry
  extending past the end of the superblock section

- for_each_downgrade_entry() is used in to_text() and needs to work on
  malformed input; it also was missing a check for a field extending
  past the end of the section

Reported-by: syzbot+e49ccab73449180bc9be@syzkaller.appspotmail.com
Fixes: 84f1638795 ("bcachefs: bch_sb_field_downgrade")
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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This commit is contained in:

Kent Overstreet 2024-05-06 09:16:33 -04:00

parent a5c3e265d3

commit 692aa7a54b

1 changed files with 12 additions and 2 deletions

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fs/bcachefs/sb-downgrade.c

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