diff options
| -rw-r--r-- | mm/process_vm_access.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index fd26d0433509..7b8d63e6c30b 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -60,6 +60,7 @@ static int process_vm_rw_pages(struct task_struct *task, int ret; ssize_t bytes_to_copy; ssize_t rc = 0; + const struct iovec *iov = lvec + *lvec_current; *bytes_copied = 0; @@ -81,8 +82,10 @@ static int process_vm_rw_pages(struct task_struct *task, pgs_copied++) { /* Make sure we have a non zero length iovec */ while (*lvec_current < lvec_cnt - && lvec[*lvec_current].iov_len == 0) + && iov->iov_len == 0) { + iov++; (*lvec_current)++; + } if (*lvec_current == lvec_cnt) break; @@ -94,18 +97,18 @@ static int process_vm_rw_pages(struct task_struct *task, bytes_to_copy = min_t(ssize_t, PAGE_SIZE - start_offset, len - *bytes_copied); bytes_to_copy = min_t(ssize_t, bytes_to_copy, - lvec[*lvec_current].iov_len + iov->iov_len - *lvec_offset); target_kaddr = kmap(process_pages[pgs_copied]) + start_offset; if (vm_write) ret = copy_from_user(target_kaddr, - lvec[*lvec_current].iov_base + iov->iov_base + *lvec_offset, bytes_to_copy); else - ret = copy_to_user(lvec[*lvec_current].iov_base + ret = copy_to_user(iov->iov_base + *lvec_offset, target_kaddr, bytes_to_copy); kunmap(process_pages[pgs_copied]); @@ -117,12 +120,13 @@ static int process_vm_rw_pages(struct task_struct *task, } *bytes_copied += bytes_to_copy; *lvec_offset += bytes_to_copy; - if (*lvec_offset == lvec[*lvec_current].iov_len) { + if (*lvec_offset == iov->iov_len) { /* * Need to copy remaining part of page into the * next iovec if there are any bytes left in page */ (*lvec_current)++; + iov++; *lvec_offset = 0; start_offset = (start_offset + bytes_to_copy) % PAGE_SIZE; |