patches/old/ntfs-do-not-dereference-a-null-ctx-on-error.patch

From: Danila Chernetsov <listdansp@mail.ru>
Subject: ntfs: do not dereference a null ctx on error
Date: Fri, 7 Apr 2023 19:44:33 +0000

In ntfs_mft_data_extend_allocation_nolock(), if an error condition occurs
prior to 'ctx' being set to a non-NULL value, avoid dereferencing the NULL
'ctx' pointer in error handling.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Link: https://lkml.kernel.org/r/20230407194433.25659-1-listdansp@mail.ru
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ntfs/mft.c |   38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

--- a/fs/ntfs/mft.c~ntfs-do-not-dereference-a-null-ctx-on-error
+++ a/fs/ntfs/mft.c
@@ -1955,36 +1955,40 @@ undo_alloc:
 				"attribute.%s", es);
 		NVolSetErrors(vol);
 	}
-	a = ctx->attr;
+
 	if (ntfs_rl_truncate_nolock(vol, &mft_ni->runlist, old_last_vcn)) {
 		ntfs_error(vol->sb, "Failed to truncate mft data attribute "
 				"runlist.%s", es);
 		NVolSetErrors(vol);
 	}
-	if (mp_rebuilt && !IS_ERR(ctx->mrec)) {
-		if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
+	if (ctx) {
+		a = ctx->attr;
+		if (mp_rebuilt && !IS_ERR(ctx->mrec)) {
+			if (ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
 				a->data.non_resident.mapping_pairs_offset),
 				old_alen - le16_to_cpu(
-				a->data.non_resident.mapping_pairs_offset),
+					a->data.non_resident.mapping_pairs_offset),
 				rl2, ll, -1, NULL)) {
-			ntfs_error(vol->sb, "Failed to restore mapping pairs "
+				ntfs_error(vol->sb, "Failed to restore mapping pairs "
 					"array.%s", es);
-			NVolSetErrors(vol);
-		}
-		if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) {
-			ntfs_error(vol->sb, "Failed to restore attribute "
+				NVolSetErrors(vol);
+			}
+			if (ntfs_attr_record_resize(ctx->mrec, a, old_alen)) {
+				ntfs_error(vol->sb, "Failed to restore attribute "
 					"record.%s", es);
-			NVolSetErrors(vol);
+				NVolSetErrors(vol);
+			}
+			flush_dcache_mft_record_page(ctx->ntfs_ino);
+			mark_mft_record_dirty(ctx->ntfs_ino);
 		}
-		flush_dcache_mft_record_page(ctx->ntfs_ino);
-		mark_mft_record_dirty(ctx->ntfs_ino);
-	} else if (IS_ERR(ctx->mrec)) {
-		ntfs_error(vol->sb, "Failed to restore attribute search "
+		else if (IS_ERR(ctx->mrec)) {
+			ntfs_error(vol->sb, "Failed to restore attribute search "
 				"context.%s", es);
-		NVolSetErrors(vol);
+			NVolSetErrors(vol);
+		}
+		if (ctx)
+			ntfs_attr_put_search_ctx(ctx);
 	}
-	if (ctx)
-		ntfs_attr_put_search_ctx(ctx);
 	if (!IS_ERR(mrec))
 		unmap_mft_record(mft_ni);
 	up_write(&mft_ni->runlist.lock);
_