* [PATCH] Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow
@ 2021-08-04 15:09 Colin King
2021-08-05 13:06 ` Marcel Holtmann
0 siblings, 1 reply; 2+ messages in thread
From: Colin King @ 2021-08-04 15:09 UTC (permalink / raw)
To: Karsten Keil, Marcel Holtmann, Johan Hedberg,
Luiz Augusto von Dentz, David S . Miller, Jakub Kicinski,
Andrei Emeltchenko, Gustavo Padovan, netdev, linux-bluetooth
Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
An earlier commit replaced using batostr to using %pMR sprintf for the
construction of session->name. Static analysis detected that this new
method can use a total of 21 characters (including the trailing '\0')
so we need to increase the BTNAMSIZ from 18 to 21 to fix potential
buffer overflows.
Addresses-Coverity: ("Out-of-bounds write")
Fixes: fcb73338ed53 ("Bluetooth: Use %pMR in sprintf/seq_printf instead of batostr")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
net/bluetooth/cmtp/cmtp.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/bluetooth/cmtp/cmtp.h b/net/bluetooth/cmtp/cmtp.h
index c32638dddbf9..f6b9dc4e408f 100644
--- a/net/bluetooth/cmtp/cmtp.h
+++ b/net/bluetooth/cmtp/cmtp.h
@@ -26,7 +26,7 @@
#include <linux/types.h>
#include <net/bluetooth/bluetooth.h>
-#define BTNAMSIZ 18
+#define BTNAMSIZ 21
/* CMTP ioctl defines */
#define CMTPCONNADD _IOW('C', 200, int)
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow
2021-08-04 15:09 [PATCH] Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow Colin King
@ 2021-08-05 13:06 ` Marcel Holtmann
0 siblings, 0 replies; 2+ messages in thread
From: Marcel Holtmann @ 2021-08-05 13:06 UTC (permalink / raw)
To: Colin King
Cc: Karsten Keil, Johan Hedberg, Luiz Augusto von Dentz,
David S. Miller, Jakub Kicinski, Andrei Emeltchenko,
Gustavo Padovan, open list:NETWORKING [GENERAL],
BlueZ, kernel-janitors, linux-kernel
Hi Colin,
> An earlier commit replaced using batostr to using %pMR sprintf for the
> construction of session->name. Static analysis detected that this new
> method can use a total of 21 characters (including the trailing '\0')
> so we need to increase the BTNAMSIZ from 18 to 21 to fix potential
> buffer overflows.
>
> Addresses-Coverity: ("Out-of-bounds write")
> Fixes: fcb73338ed53 ("Bluetooth: Use %pMR in sprintf/seq_printf instead of batostr")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/bluetooth/cmtp/cmtp.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
patch has been applied to bluetooth-next tree.
Regards
Marcel
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