svn commit: r293683 - head/sys/fs/ext2fs

[Pedro F. Giffuni]

Author: pfg
Date: Mon Jan 11 19:25:43 2016
New Revision: 293683
URL: https://svnweb.freebsd.org/changeset/base/293683

Log:
  ext4: mount panic from freeing invalid pointers
  
  Initialize the struct with those fields to zeroes on allocation,
  preventing the panic.
  
  Patch by:	Damjan Jovanovic.
  
  PR:		206056
  MFC after:	3 days

Modified:
  head/sys/fs/ext2fs/ext2_vfsops.c

Modified: head/sys/fs/ext2fs/ext2_vfsops.c
==============================================================================
--- head/sys/fs/ext2fs/ext2_vfsops.c	Mon Jan 11 19:22:58 2016	(r293682)
+++ head/sys/fs/ext2fs/ext2_vfsops.c	Mon Jan 11 19:25:43 2016	(r293683)
@@ -590,7 +590,7 @@ ext2_mountfs(struct vnode *devvp, struct
 	 * while Linux keeps the super block in a locked buffer.
 	 */
 	ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
-		M_EXT2MNT, M_WAITOK);
+		M_EXT2MNT, M_WAITOK | M_ZERO);
 	ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
 		M_EXT2MNT, M_WAITOK);
 	mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);