Merge tag 'ubifs-for-linus-6.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs

Pull UBI fixes from Richard Weinberger:

 - Fix failure to attach when vid_hdr offset equals the (sub)page size

 - Fix for a deadlock in UBI's worker thread

* tag 'ubifs-for-linus-6.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs:
  ubi: Fix failure attaching when vid_hdr offset equals to (sub)page size
  ubi: Fix deadlock caused by recursively holding work_sem

1 files changed, 15 insertions, 6 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 0904eb40c95f..ad025b2ee417 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -666,12 +666,6 @@ static int io_init(struct ubi_device *ubi, int max_beb_per1024)
 	ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
 	ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
 
-	if (ubi->vid_hdr_offset && ((ubi->vid_hdr_offset + UBI_VID_HDR_SIZE) >
-	    ubi->vid_hdr_alsize)) {
-		ubi_err(ubi, "VID header offset %d too large.", ubi->vid_hdr_offset);
-		return -EINVAL;
-	}
-
 	dbg_gen("min_io_size      %d", ubi->min_io_size);
 	dbg_gen("max_write_size   %d", ubi->max_write_size);
 	dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
@@ -689,6 +683,21 @@ static int io_init(struct ubi_device *ubi, int max_beb_per1024)
 						ubi->vid_hdr_aloffset;
 	}
 
+	/*
+	 * Memory allocation for VID header is ubi->vid_hdr_alsize
+	 * which is described in comments in io.c.
+	 * Make sure VID header shift + UBI_VID_HDR_SIZE not exceeds
+	 * ubi->vid_hdr_alsize, so that all vid header operations
+	 * won't access memory out of bounds.
+	 */
+	if ((ubi->vid_hdr_shift + UBI_VID_HDR_SIZE) > ubi->vid_hdr_alsize) {
+		ubi_err(ubi, "Invalid VID header offset %d, VID header shift(%d)"
+			" + VID header size(%zu) > VID header aligned size(%d).",
+			ubi->vid_hdr_offset, ubi->vid_hdr_shift,
+			UBI_VID_HDR_SIZE, ubi->vid_hdr_alsize);
+		return -EINVAL;
+	}
+
 	/* Similar for the data offset */
 	ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE;
 	ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);