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Merge remote-tracking branches 'regulator/fix/as3722', 'regulator/fix/ltc3589' and...
[firefly-linux-kernel-4.4.55.git]
/
drivers
/
char
/
mem.c
diff --git
a/drivers/char/mem.c
b/drivers/char/mem.c
index 92c5937f80c33acac907dccb2377b6157721b33c..917403fe10da3eb62c0548bb29a2f0d898c8400a 100644
(file)
--- a/
drivers/char/mem.c
+++ b/
drivers/char/mem.c
@@
-99,6
+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;
@@
-157,6
+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;