read_code(): go through vfs_read() instead of calling the method directly

... and don't skip on sanity checks.  It's *not* a hot path, TYVM
(a couple of calls per a.out execve(), for pity sake) and headers of
random a.out binary are not to be trusted.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exec.c b/fs/exec.c
index 3d78fcc..4cc9453 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -810,7 +810,7 @@ EXPORT_SYMBOL(kernel_read);
 
 ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
 {
-       ssize_t res = file->f_op->read(file, (void __user *)addr, len, &pos);
+       ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);
        if (res > 0)
                flush_icache_range(addr, addr + len);
        return res;