From: "Chen.Yu" <[email protected]> There is a potential integer overflow in megadev_ioctl() if userspace passes in a large u32 variable uioc.adapno. The int variable adapno would < 0, leading to an error array access for hdb_soft_state[adapno], or an error copy_to_user(uioc.uioc_uaddr, mcontroller+adapno,..)
Reported-by: Wenliang Fan <[email protected]> Suggested-by: Qixue Xiao <[email protected]> Signed-off-by: Yu Chen <[email protected]> Reviewed-by: Levente Kurusa <[email protected]> --- drivers/scsi/megaraid.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c index 816db12..0b90c54 100644 --- a/drivers/scsi/megaraid.c +++ b/drivers/scsi/megaraid.c @@ -3099,7 +3099,10 @@ megadev_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) /* * Which adapter */ - if( (adapno = GETADAP(uioc.adapno)) >= hba_count ) + adapno = GETADAP(uioc.adapno); + if( adapno < 0 ) + return (-EINVAL); + if( adapno >= hba_count ) return (-ENODEV); if( copy_to_user(uioc.uioc_uaddr, mcontroller+adapno, @@ -3113,7 +3116,10 @@ megadev_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) /* * Which adapter */ - if( (adapno = GETADAP(uioc.adapno)) >= hba_count ) + adapno = GETADAP(uioc.adapno); + if( adapno < 0 ) + return (-EINVAL); + if( adapno >= hba_count ) return (-ENODEV); adapter = hba_soft_state[adapno]; @@ -3160,7 +3166,10 @@ megadev_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) /* * Which adapter */ - if( (adapno = GETADAP(uioc.adapno)) >= hba_count ) + adapno = GETADAP(uioc.adapno); + if( adapno < 0 ) + return (-EINVAL); + if( adapno >= hba_count ) return (-ENODEV); adapter = hba_soft_state[adapno]; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
