Re: [syzbot] Re: general protection fault in exfat_get_dentry_cached()
From: syzbot
Date: Fri Dec 13 2024 - 03:17:22 EST
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Subject: Re: general protection fault in exfat_get_dentry_cached()
Author: dmantipov@xxxxxxxxx
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f932fb9b40749d1c9a539d89bb3e288c077aafe5
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 97d2774760fe..c356bde623bf 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -329,10 +329,7 @@ static int exfat_find_empty_entry(struct inode *inode,
EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
- num_entries, es)) < 0) {
- if (dentry == -EIO)
- break;
-
+ num_entries, es)) == -ENOSPC) {
if (exfat_check_max_dentries(inode))
return -ENOSPC;
@@ -395,6 +392,9 @@ static int exfat_find_empty_entry(struct inode *inode,
inode->i_blocks += sbi->cluster_size >> 9;
}
+ if (dentry < 0)
+ return dentry;
+
p_dir->dir = exfat_sector_to_cluster(sbi, es->bh[0]->b_blocknr);
p_dir->size -= dentry / sbi->dentries_per_clu;