From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Date: Thu, 30 May 2024 07:44:17 +0000 (+0300)
Subject: fs/ntfs3: Fix attr_insert_range at end of file
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=519f38de57cd0c5e0043795b5fb0686c97311f6d;p=linux.git

fs/ntfs3: Fix attr_insert_range at end of file

If the offset is equal to or greater than the end of
file, an error is returned. For such operations (i.e., inserting
a hole at the end of file), ftruncate(2) should be used.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---

diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index 0d13da5523b1..68d1c61fe3b5 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -2373,8 +2373,13 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
 		mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
 	}
 
-	if (vbo > data_size) {
-		/* Insert range after the file size is not allowed. */
+	if (vbo >= data_size) {
+		/*
+		 * Insert range after the file size is not allowed.
+		 * If the offset is equal to or greater than the end of
+		 * file, an error is returned.  For such operations (i.e., inserting
+		 * a hole at the end of file), ftruncate(2) should be used.
+		 */
 		return -EINVAL;
 	}