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pstore: switch to copy_from_user()

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don't bother trying to do bulk access_ok()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-02-18 15:43:52 -05:00
parent daa98831dd
commit ff84778104
1 changed files with 1 additions and 3 deletions
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4
fs/pstore/ram_core.c
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@ -283,7 +283,7 @@ static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz,
const void __user *s, unsigned int start, unsigned int count)
{
struct persistent_ram_buffer *buffer = prz->buffer;
int ret = unlikely(__copy_from_user(buffer->data + start, s, count)) ?
int ret = unlikely(copy_from_user(buffer->data + start, s, count)) ?
-EFAULT : 0;
persistent_ram_update_ecc(prz, start, count);
return ret;
@ -348,8 +348,6 @@ int notrace persistent_ram_write_user(struct persistent_ram_zone *prz,
int rem, ret = 0, c = count;
size_t start;
if (unlikely(!access_ok(s, count)))
return -EFAULT;
if (unlikely(c > prz->buffer_size)) {
s += c - prz->buffer_size;
c = prz->buffer_size;