提交 70daca2c 编写于 作者: R Rustam Kovhaev 提交者: Chen Jun

reiserfs: add check for an invalid ih_entry_count

stable inclusion
from stable-5.10.5
commit a021b66961324889ad223607152e8c9db941b03f
bugzilla: 46931

--------------------------------

commit d24396c5 upstream.

when directory item has an invalid value set for ih_entry_count it might
trigger use-after-free or out-of-bounds read in bin_search_in_dir_item()

ih_entry_count * IH_SIZE for directory item should not be larger than
ih_item_len

Link: https://lore.kernel.org/r/20201101140958.3650143-1-rkovhaev@gmail.com
Reported-and-tested-by: syzbot+83b6f7cf9922cae5c4d7@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=83b6f7cf9922cae5c4d7Signed-off-by: NRustam Kovhaev <rkovhaev@gmail.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
上级 3fcc27c3
......@@ -454,6 +454,12 @@ static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
"(second one): %h", ih);
return 0;
}
if (is_direntry_le_ih(ih) && (ih_item_len(ih) < (ih_entry_count(ih) * IH_SIZE))) {
reiserfs_warning(NULL, "reiserfs-5093",
"item entry count seems wrong %h",
ih);
return 0;
}
prev_location = ih_location(ih);
}
......
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