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Tue, 11 May 2021 00:12:07 -0700 Date: Tue, 11 May 2021 10:12:00 +0300 From: Dan Carpenter To: Richard Weinberger Cc: Miquel Raynal , Vignesh Raghavendra , Artem Bityutskiy , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] ubifs: fix snprintf() checking Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding X-Proofpoint-GUID: 3wvVLYegYHyQAbTUgjskSeriImquWwta X-Proofpoint-ORIG-GUID: 3wvVLYegYHyQAbTUgjskSeriImquWwta X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9980 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1011 priorityscore=1501 adultscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105110054 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210511_001227_140371_611C4953 X-CRM114-Status: GOOD ( 16.41 ) /bin/ln: failed to access 'reaver_cache/texts/20210511_001227_140371_611C4953': No such file or directory X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210511_001227_140371_611C4953 X-CRM114-Status: GOOD ( 13.63 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org The snprintf() function returns the number of characters (not counting the NUL terminator) that it would have printed if we had space. This buffer has UBIFS_DFS_DIR_LEN characters plus one extra for the terminator. Printing UBIFS_DFS_DIR_LEN is okay but anything higher will result in truncation. Thus the comparison needs to be change from == to >. These strings are compile time constants so this patch doesn't affect runtime. Fixes: ae380ce04731 ("UBIFS: lessen the size of debugging info data structure") Signed-off-by: Dan Carpenter --- drivers/mtd/ubi/debug.c | 2 +- fs/ubifs/debug.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c index ac2bdba8bb1a..3c0c8eca4d51 100644 --- a/drivers/mtd/ubi/debug.c +++ b/drivers/mtd/ubi/debug.c @@ -511,7 +511,7 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi) n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, ubi->ubi_num); - if (n == UBI_DFS_DIR_LEN) { + if (n > UBI_DFS_DIR_LEN) { /* The array size is too small */ return -EINVAL; } diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index 1bbb9fe661b1..fc718f6178f2 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2824,7 +2824,7 @@ void dbg_debugfs_init_fs(struct ubifs_info *c) n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME, c->vi.ubi_num, c->vi.vol_id); - if (n == UBIFS_DFS_DIR_LEN) { + if (n > UBIFS_DFS_DIR_LEN) { /* The array size is too small */ return; } -- 2.30.2 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/