fix braino in generic_file_read_iter()

[mirror_ubuntu-bionic-kernel.git] / lib / iov_iter.c

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 60abc44385b795de7449b3810e9e294b7d2c48fc..fc9fb29d00eba257c99fa63de7c990a80bf075a4 100644 (file)
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -790,6 +790,8 @@ void iov_iter_revert(struct iov_iter *i, size_t unroll)
 {
        if (!unroll)
                return;
+       if (WARN_ON(unroll > MAX_RW_COUNT))
+               return;
        i->count += unroll;
        if (unlikely(i->type & ITER_PIPE)) {
                struct pipe_inode_info *pipe = i->pipe;