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Thu, 26 Feb 2026 18:32:16 -0800 (PST) Date: Fri, 27 Feb 2026 11:32:14 +0900 From: Hyunchul Lee To: Ethan Tidmore Cc: linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] ntfs: Place check before dereference Message-ID: References: <20260226160906.7175-1-ethantidmore06@gmail.com> <20260226160906.7175-2-ethantidmore06@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260226160906.7175-2-ethantidmore06@gmail.com> On Thu, Feb 26, 2026 at 10:09:04AM -0600, Ethan Tidmore wrote: > The variable ni has the possiblity of being null and is checked for it > but, only after it was dereferenced in a log message. > > Put check before dereference. > > Detected by Smatch: > fs/ntfs/attrib.c:2115 ntfs_resident_attr_record_add() warn: > variable dereferenced before check 'ni' (see line 2111) > > fs/ntfs/attrib.c:2237 ntfs_non_resident_attr_record_add() warn: > variable dereferenced before check 'ni' (see line 2232) > > Signed-off-by: Ethan Tidmore Looks good to me. Thank for the patch Reviewed-by: Hyunchul Lee > --- > fs/ntfs/attrib.c | 12 ++++++------ > 1 file changed, 6 insertions(+), 6 deletions(-) > > diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c > index e8285264f619..e260540eb7c5 100644 > --- a/fs/ntfs/attrib.c > +++ b/fs/ntfs/attrib.c > @@ -2108,13 +2108,13 @@ int ntfs_resident_attr_record_add(struct ntfs_inode *ni, __le32 type, > int err, offset; > struct ntfs_inode *base_ni; > > + if (!ni || (!name && name_len)) > + return -EINVAL; > + > ntfs_debug("Entering for inode 0x%llx, attr 0x%x, flags 0x%x.\n", > (long long) ni->mft_no, (unsigned int) le32_to_cpu(type), > (unsigned int) le16_to_cpu(flags)); > > - if (!ni || (!name && name_len)) > - return -EINVAL; > - > err = ntfs_attr_can_be_resident(ni->vol, type); > if (err) { > if (err == -EPERM) > @@ -2229,14 +2229,14 @@ static int ntfs_non_resident_attr_record_add(struct ntfs_inode *ni, __le32 type, > struct ntfs_inode *base_ni; > int err, offset; > > + if (!ni || dataruns_size <= 0 || (!name && name_len)) > + return -EINVAL; > + > ntfs_debug("Entering for inode 0x%llx, attr 0x%x, lowest_vcn %lld, dataruns_size %d, flags 0x%x.\n", > (long long) ni->mft_no, (unsigned int) le32_to_cpu(type), > (long long) lowest_vcn, dataruns_size, > (unsigned int) le16_to_cpu(flags)); > > - if (!ni || dataruns_size <= 0 || (!name && name_len)) > - return -EINVAL; > - > err = ntfs_attr_can_be_non_resident(ni->vol, type); > if (err) { > if (err == -EPERM) > -- > 2.53.0 > -- Thanks, Hyunchul