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f2fs: return early when trying to read null nid 

If get_node_page() gets zero nid, we can return early without getting a wrong
page. For example, get_dnode_of_data() can try to do that.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-12-23 14:17:47 -08:00
parent 2aadac085c
commit 4aa69d5667
1 changed files with 4 additions and 0 deletions
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4
fs/f2fs/node.c
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@ -1059,6 +1059,10 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
{ {
struct page *page; struct page *page;
int err; int err;
if (!nid)
return ERR_PTR(-ENOENT);
f2fs_bug_on(sbi, check_nid_range(sbi, nid));
repeat: repeat:
page = grab_cache_page(NODE_MAPPING(sbi), nid); page = grab_cache_page(NODE_MAPPING(sbi), nid);
if (!page) if (!page)