diff options
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index f895a8c8a24..917403fe10d 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -22,7 +22,6 @@ #include <linux/device.h> #include <linux/highmem.h> #include <linux/backing-dev.h> -#include <linux/bootmem.h> #include <linux/splice.h> #include <linux/pfn.h> #include <linux/export.h> @@ -100,6 +99,9 @@ static ssize_t read_mem(struct file *file, char __user *buf, ssize_t read, sz; char *ptr; + if (p != *ppos) + return 0; + if (!valid_phys_addr_range(p, count)) return -EFAULT; read = 0; @@ -158,6 +160,9 @@ static ssize_t write_mem(struct file *file, const char __user *buf, unsigned long copied; void *ptr; + if (p != *ppos) + return -EFBIG; + if (!valid_phys_addr_range(p, count)) return -EFAULT; |