cpufreq: fix overflow in cpufreq_table_find_index_dl()

[cascardo/linux.git] / lib / iov_iter.c

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index d67c828..9e8c738 100644 (file)
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -144,7 +144,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
        buf = iov->iov_base + skip;
        copy = min(bytes, iov->iov_len - skip);
 
-       if (!fault_in_pages_writeable(buf, copy)) {
+       if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_writeable(buf, copy)) {
                kaddr = kmap_atomic(page);
                from = kaddr + offset;
 
@@ -175,6 +175,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
                copy = min(bytes, iov->iov_len - skip);
        }
        /* Too bad - revert to non-atomic kmap */
+
        kaddr = kmap(page);
        from = kaddr + offset;
        left = __copy_to_user(buf, from, copy);
@@ -193,6 +194,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
                bytes -= copy;
        }
        kunmap(page);
+
 done:
        if (skip == iov->iov_len) {
                iov++;
@@ -225,7 +227,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
        buf = iov->iov_base + skip;
        copy = min(bytes, iov->iov_len - skip);
 
-       if (!fault_in_pages_readable(buf, copy)) {
+       if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_readable(buf, copy)) {
                kaddr = kmap_atomic(page);
                to = kaddr + offset;
 
@@ -256,6 +258,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
                copy = min(bytes, iov->iov_len - skip);
        }
        /* Too bad - revert to non-atomic kmap */
+
        kaddr = kmap(page);
        to = kaddr + offset;
        left = __copy_from_user(to, buf, copy);
@@ -274,6 +277,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
                bytes -= copy;
        }
        kunmap(page);
+
 done:
        if (skip == iov->iov_len) {
                iov++;