sgi-gru: decrapfiy options_write() function
Not a single line of actual code in the function was really fundamentally correct. Problems ranged from lack of proper range checking, to removing the last character written (which admittedly is usually '\n'), to not accepting hex numbers even though the 'show' routine would show the data in that format. This tries to do better. Acked-by: Michael Buesch <mb@bu3sch.de> Tested-and-acked-by: Jack Steiner <steiner@sgi.com> Cc: stable@kernel.org Cc: Jiri Kosina <jkosina@suse.cz> Cc: Michael Gilbert <michael.s.gilbert@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -161,14 +161,15 @@ static int options_show(struct seq_file *s, void *p)
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static ssize_t options_write(struct file *file, const char __user *userbuf,
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size_t count, loff_t *data)
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{
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unsigned long val;
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char buf[80];
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char buf[20];
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if (strncpy_from_user(buf, userbuf, sizeof(buf) - 1) < 0)
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if (count >= sizeof(buf))
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return -EINVAL;
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if (copy_from_user(buf, userbuf, count))
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return -EFAULT;
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buf[count - 1] = '\0';
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if (!strict_strtoul(buf, 10, &val))
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gru_options = val;
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buf[count] = '\0';
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if (strict_strtoul(buf, 0, &gru_options))
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return -EINVAL;
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return count;
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}
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