| Message ID | 7ba06db8987298f082f83a425769fe6fa6715fe7.1697911385.git.christophe.jaillet@wanadoo.fr (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [net] net: ieee802154: adf7242: Fix some potential buffer overflow in adf7242_stats_show() | expand |
Hello: This patch was applied to netdev/net.git (main) by David S. Miller <davem@davemloft.net>: On Sat, 21 Oct 2023 20:03:53 +0200 you wrote: > strncat() usage in adf7242_debugfs_init() is wrong. > The size given to strncat() is the maximum number of bytes that can be > written, excluding the trailing NULL. > > Here, the size that is passed, DNAME_INLINE_LEN, does not take into account > the size of "adf7242-" that is already in the array. > > [...] Here is the summary with links: - [net] net: ieee802154: adf7242: Fix some potential buffer overflow in adf7242_stats_show() https://git.kernel.org/netdev/net/c/ca082f019d8f You are awesome, thank you!
> -----Original Message----- > From: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > Sent: Samstag, 21. Oktober 2023 20:04 > To: keescook@chromium.org; Hennerich, Michael > <Michael.Hennerich@analog.com>; Alexander Aring <alex.aring@gmail.com>; > Stefan Schmidt <stefan@datenfreihafen.org>; Miquel Raynal > <miquel.raynal@bootlin.com>; David S. Miller <davem@davemloft.net>; Eric > Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo > Abeni <pabeni@redhat.com>; Marcel Holtmann <marcel@holtmann.org> > Cc: linux-hardening@vger.kernel.org; linux-kernel@vger.kernel.org; kernel- > janitors@vger.kernel.org; Christophe JAILLET <christophe.jaillet@wanadoo.fr>; > Stefan Schmidt <stefan@osg.samsung.com>; linux-wpan@vger.kernel.org; > netdev@vger.kernel.org > Subject: [PATCH net] net: ieee802154: adf7242: Fix some potential buffer > overflow in adf7242_stats_show() > > > strncat() usage in adf7242_debugfs_init() is wrong. > The size given to strncat() is the maximum number of bytes that can be written, > excluding the trailing NULL. > > Here, the size that is passed, DNAME_INLINE_LEN, does not take into account > the size of "adf7242-" that is already in the array. > > In order to fix it, use snprintf() instead. > > Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC > IEEE802154") > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > --- Acked-by: Michael Hennerich <michael.hennerich@analog.com> > drivers/net/ieee802154/adf7242.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ieee802154/adf7242.c > b/drivers/net/ieee802154/adf7242.c > index a03490ba2e5b..cc7ddc40020f 100644 > --- a/drivers/net/ieee802154/adf7242.c > +++ b/drivers/net/ieee802154/adf7242.c > @@ -1162,9 +1162,10 @@ static int adf7242_stats_show(struct seq_file *file, > void *offset) > > static void adf7242_debugfs_init(struct adf7242_local *lp) { > - char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-"; > + char debugfs_dir_name[DNAME_INLINE_LEN + 1]; > > - strncat(debugfs_dir_name, dev_name(&lp->spi->dev), > DNAME_INLINE_LEN); > + snprintf(debugfs_dir_name, sizeof(debugfs_dir_name), > + "adf7242-%s", dev_name(&lp->spi->dev)); > > lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL); > > -- > 2.34.1
diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c index a03490ba2e5b..cc7ddc40020f 100644 --- a/drivers/net/ieee802154/adf7242.c +++ b/drivers/net/ieee802154/adf7242.c @@ -1162,9 +1162,10 @@ static int adf7242_stats_show(struct seq_file *file, void *offset) static void adf7242_debugfs_init(struct adf7242_local *lp) { - char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-"; + char debugfs_dir_name[DNAME_INLINE_LEN + 1]; - strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN); + snprintf(debugfs_dir_name, sizeof(debugfs_dir_name), + "adf7242-%s", dev_name(&lp->spi->dev)); lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
strncat() usage in adf7242_debugfs_init() is wrong. The size given to strncat() is the maximum number of bytes that can be written, excluding the trailing NULL. Here, the size that is passed, DNAME_INLINE_LEN, does not take into account the size of "adf7242-" that is already in the array. In order to fix it, use snprintf() instead. Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- drivers/net/ieee802154/adf7242.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)