[PATCH AUTOSEL 6.4 04/16] ntfs: do not dereference a null ctx on error

[Sasha Levin]

From: Danila Chernetsov <listdansp@xxxxxxx>

[ Upstream commit aa4b92c5234878d55da96d387ea4d3695ca5e4ab ]

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.

Signed-off-by: Danila Chernetsov <listdansp@xxxxxxx>
Reviewed-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/ntfs/mft.c | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 48030899dc6ec..0155f106ec344 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -1955,36 +1955,38 @@ static int ntfs_mft_data_extend_allocation_nolock(ntfs_volume *vol)
 				"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);
+			}
+			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 "
+				"context.%s", es);
 			NVolSetErrors(vol);
 		}
-		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 "
-				"context.%s", es);
-		NVolSetErrors(vol);
-	}
-	if (ctx)
 		ntfs_attr_put_search_ctx(ctx);
+	}
 	if (!IS_ERR(mrec))
 		unmap_mft_record(mft_ni);
 	up_write(&mft_ni->runlist.lock);
-- 
2.39.2