diff options
| author | Dave Airlie <airlied@redhat.com> | 2017-01-27 11:00:42 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2017-01-27 11:00:42 +1000 |
| commit | b0df0b251b25b0bf89ef3e518330fcac300add86 (patch) | |
| tree | 962d8f7e91b2552a87af230762085ad97292a091 /drivers/char/mem.c | |
| parent | f0493e653f9679114d1dfd54ab88b54ce95576e1 (diff) | |
| parent | ff9f8a7cf935468a94d9927c68b00daae701667e (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into drm-next
Backmerge Linus master to get the connector locking revert.
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux: (645 commits)
sysctl: fix proc_doulongvec_ms_jiffies_minmax()
Revert "drm/probe-helpers: Drop locking from poll_enable"
MAINTAINERS: add Dan Streetman to zbud maintainers
MAINTAINERS: add Dan Streetman to zswap maintainers
mm: do not export ioremap_page_range symbol for external module
mn10300: fix build error of missing fpu_save()
romfs: use different way to generate fsid for BLOCK or MTD
frv: add missing atomic64 operations
mm, page_alloc: fix premature OOM when racing with cpuset mems update
mm, page_alloc: move cpuset seqcount checking to slowpath
mm, page_alloc: fix fast-path race with cpuset update or removal
mm, page_alloc: fix check for NULL preferred_zone
kernel/panic.c: add missing \n
fbdev: color map copying bounds checking
frv: add atomic64_add_unless()
mm/mempolicy.c: do not put mempolicy before using its nodemask
radix-tree: fix private list warnings
Documentation/filesystems/proc.txt: add VmPin
mm, memcg: do not retry precharge charges
proc: add a schedule point in proc_pid_readdir()
...
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 5bb1985ec484..6d9cc2d39d22 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -381,9 +381,6 @@ static ssize_t read_kmem(struct file *file, char __user *buf, char *kbuf; /* k-addr because vread() takes vmlist_lock rwlock */ int err = 0; - if (!pfn_valid(PFN_DOWN(p))) - return -EIO; - read = 0; if (p < (unsigned long) high_memory) { low_count = count; @@ -412,6 +409,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf, * by the kernel or data corruption may occur */ kbuf = xlate_dev_kmem_ptr((void *)p); + if (!virt_addr_valid(kbuf)) + return -ENXIO; if (copy_to_user(buf, kbuf, sz)) return -EFAULT; @@ -482,6 +481,8 @@ static ssize_t do_write_kmem(unsigned long p, const char __user *buf, * corruption may occur. */ ptr = xlate_dev_kmem_ptr((void *)p); + if (!virt_addr_valid(ptr)) + return -ENXIO; copied = copy_from_user(ptr, buf, sz); if (copied) { @@ -512,9 +513,6 @@ static ssize_t write_kmem(struct file *file, const char __user *buf, char *kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */ int err = 0; - if (!pfn_valid(PFN_DOWN(p))) - return -EIO; - if (p < (unsigned long) high_memory) { unsigned long to_write = min_t(unsigned long, count, (unsigned long)high_memory - p); |