Showing error 1880

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: mm/shmem.c
Line in file: 960
Project: Linux Kernel
Project version: 2.6.28
Tools: Smatch (1.59)
Entered: 2013-09-11 08:47:26 UTC

Source: 

 930                goto out;
 931        }
 932        error = 1;
 933
 934        spin_lock(&info->lock);
 935        ptr = shmem_swp_entry(info, idx, NULL);
 936        if (ptr && ptr->val == entry.val) {
 937                error = add_to_page_cache_locked(page, inode->i_mapping,
 938                                                idx, GFP_NOWAIT);
 939                /* does mem_cgroup_uncharge_cache_page on error */
 940        } else        /* we must compensate for our precharge above */
 941                mem_cgroup_uncharge_cache_page(page);
 942
 943        if (error == -EEXIST) {
 944                struct page *filepage = find_get_page(inode->i_mapping, idx);
 945                error = 1;
 946                if (filepage) {
 947                        /*
 948                         * There might be a more uptodate page coming down
 949                         * from a stacked writepage: forget our swappage if so.
 950                         */
 951                        if (PageUptodate(filepage))
 952                                error = 0;
 953                        page_cache_release(filepage);
 954                }
 955        }
 956        if (!error) {
 957                delete_from_swap_cache(page);
 958                set_page_dirty(page);
 959                info->flags |= SHMEM_PAGEIN;
 960                shmem_swp_set(info, ptr, 0);
 961                swap_free(entry);
 962                error = 1;        /* not an error, but entry was found */
 963        }
 964        if (ptr)
 965                shmem_swp_unmap(ptr);
 966        spin_unlock(&info->lock);
 967        radix_tree_preload_end();
 968out:
 969        unlock_page(page);
 970        page_cache_release(page);
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