Re: [syzbot] [nilfs?] KASAN: use-after-free Read in nilfs_find_entry
From: Ryusuke Konishi
Date: Tue Nov 12 2024 - 09:12:31 EST
Test fix for local variable type in nilfs_last_byte()
#syz test
diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index a8602729586a..6bc8f474a3e5 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -70,7 +70,7 @@ static inline unsigned int nilfs_chunk_size(struct inode *inode)
*/
static unsigned int nilfs_last_byte(struct inode *inode, unsigned long page_nr)
{
- unsigned int last_byte = inode->i_size;
+ loff_t last_byte = inode->i_size;
last_byte -= page_nr << PAGE_SHIFT;
if (last_byte > PAGE_SIZE)