From eafe1aa37e6ec2d56f14732b5240c4dd09f0613a Mon Sep 17 00:00:00 2001 From: Karsten Keil Date: Sat, 1 Dec 2007 12:16:15 -0800 Subject: [PATCH] I4L: fix isdn_ioctl memory overrun vulnerability Fix possible memory overrun issue in the isdn ioctl code. Found by ADLAB Signed-off-by: Karsten Keil Cc: ADLAB Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/isdn/i4l/isdn_common.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c index c6df2925eb..d6952959d7 100644 --- a/drivers/isdn/i4l/isdn_common.c +++ b/drivers/isdn/i4l/isdn_common.c @@ -1515,6 +1515,7 @@ isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg) if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct))) return -EFAULT; + iocts.drvid[sizeof(iocts.drvid)-1] = 0; if (strlen(iocts.drvid)) { if ((p = strchr(iocts.drvid, ','))) *p = 0; @@ -1599,6 +1600,7 @@ isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg) if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct))) return -EFAULT; + iocts.drvid[sizeof(iocts.drvid)-1] = 0; if (strlen(iocts.drvid)) { drvidx = -1; for (i = 0; i < ISDN_MAX_DRIVERS; i++) @@ -1643,7 +1645,7 @@ isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg) } else { p = (char __user *) iocts.arg; for (i = 0; i < 10; i++) { - sprintf(bname, "%s%s", + snprintf(bname, sizeof(bname), "%s%s", strlen(dev->drv[drvidx]->msn2eaz[i]) ? dev->drv[drvidx]->msn2eaz[i] : "_", (i < 9) ? "," : "\0"); @@ -1673,6 +1675,7 @@ isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg) char *p; if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct))) return -EFAULT; + iocts.drvid[sizeof(iocts.drvid)-1] = 0; if (strlen(iocts.drvid)) { if ((p = strchr(iocts.drvid, ','))) *p = 0; -- 2.39.5