From: Chao Yu <yuch...@huawei.com>
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.carpen...@oracle.com>
Signed-off-by: Chao Yu <yuch...@huawei.com>
---
fs/f2fs/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index be8be445c6ed..230845221c74 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -586,7 +586,7 @@ static int parse_options(struct super_block *sb, char
*options)
case Opt_io_size_bits:
if (args->from && match_int(args, &arg))
return -EINVAL;
- if (arg > __ilog2_u32(BIO_MAX_PAGES)) {
+ if (arg <= 0 || arg > __ilog2_u32(BIO_MAX_PAGES)) {
f2fs_msg(sb, KERN_WARNING,
"Not support %d, larger than %d",
1 << arg, BIO_MAX_PAGES);
--
2.18.0
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