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f2fs: don't allow negative ->write_io_size_bits
As Dan reported: "We put an upper bound on ->write_io_size_bits but we don't have a lower bound." So let's add lower bound check for ->write_io_size_bits in parse_options(). [We don't allow configuring ->write_io_size_bits to zero, since at least we need to fill one dummy page for aligned IO.] Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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@ -586,7 +586,7 @@ static int parse_options(struct super_block *sb, char *options)
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case Opt_io_size_bits:
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if (args->from && match_int(args, &arg))
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return -EINVAL;
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if (arg > __ilog2_u32(BIO_MAX_PAGES)) {
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if (arg <= 0 || arg > __ilog2_u32(BIO_MAX_PAGES)) {
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f2fs_msg(sb, KERN_WARNING,
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"Not support %d, larger than %d",
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1 << arg, BIO_MAX_PAGES);
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