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smackfs: restrict bytes count in smk_set_cipso()
commit49ec114a6e
upstream. Oops, I failed to update subject line. From 07571157c91b98ce1a4aa70967531e64b78e8346 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Date: Mon, 12 Apr 2021 22:25:06 +0900 Subject: smackfs: restrict bytes count in smk_set_cipso() Commit7ef4c19d24
("smackfs: restrict bytes count in smackfs write functions") missed that count > SMK_CIPSOMAX check applies to only format == SMK_FIXED24_FMT case. Reported-by: syzbot <syzbot+77c53db50c9fff774e8e@syzkaller.appspotmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -883,6 +883,8 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
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if (format == SMK_FIXED24_FMT &&
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(count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
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return -EINVAL;
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if (count > PAGE_SIZE)
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return -EINVAL;
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data = memdup_user_nul(buf, count);
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if (IS_ERR(data))
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