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Message-ID: <20250406145327.191479-2-integral@archlinuxcn.org>
Date: Sun, 6 Apr 2025 22:53:28 +0800
From: Integral <integral@...hlinuxcn.org>
To: kent.overstreet@...ux.dev
Cc: integral@...hlinuxcn.org,
kent.overstreet@...il.com,
linux-bcachefs@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] bcachefs: early return for negative values when parsing BCH_OPT_UINT
Currently, when passing a negative integer as argument, the error
message is "too big" due to casting to an unsigned integer:
> bcachefs format --block_size=-1 bcachefs.img
invalid option: block_size: too big (max 65536)
When negative value in argument detected, return early before
calling bch2_opt_validate().
A new error code `BCH_ERR_option_negative` is added.
Signed-off-by: Integral <integral@...hlinuxcn.org>
---
fs/bcachefs/errcode.h | 1 +
fs/bcachefs/opts.c | 12 +++++++++---
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/fs/bcachefs/errcode.h b/fs/bcachefs/errcode.h
index c4eb0ed9838d..e3c85288fd6d 100644
--- a/fs/bcachefs/errcode.h
+++ b/fs/bcachefs/errcode.h
@@ -213,6 +213,7 @@
x(EINVAL, inode_unpack_error) \
x(EINVAL, varint_decode_error) \
x(EINVAL, erasure_coding_found_btree_node) \
+ x(EINVAL, option_negative) \
x(EOPNOTSUPP, may_not_use_incompat_feature) \
x(EROFS, erofs_trans_commit) \
x(EROFS, erofs_no_writes) \
diff --git a/fs/bcachefs/opts.c b/fs/bcachefs/opts.c
index e64777ecf44f..1bf2580ab735 100644
--- a/fs/bcachefs/opts.c
+++ b/fs/bcachefs/opts.c
@@ -360,9 +360,15 @@ int bch2_opt_parse(struct bch_fs *c,
return -EINVAL;
}
- ret = opt->flags & OPT_HUMAN_READABLE
- ? bch2_strtou64_h(val, res)
- : kstrtou64(val, 10, res);
+ if (*val != '-') {
+ ret = opt->flags & OPT_HUMAN_READABLE
+ ? bch2_strtou64_h(val, res)
+ : kstrtou64(val, 10, res);
+ } else {
+ prt_printf(err, "%s: must be a non-negative number", opt->attr.name);
+ return -BCH_ERR_option_negative;
+ }
+
if (ret < 0) {
if (err)
prt_printf(err, "%s: must be a number",
--
2.49.0
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