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freevxfs: possible null pointer dereference fix 

sb_read may return NULL, so let's explicitly check it.

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitriy Monakhov 2007-05-08 00:24:34 -07:00 committed by Linus Torvalds
parent 1368c4f248
commit 82f703bb8c
2 changed files with 2 additions and 2 deletions
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2
fs/freevxfs/vxfs_bmap.c
View File

@ -137,7 +137,7 @@ vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
bp = sb_bread(ip->i_sb,
indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
if (!buffer_mapped(bp))
if (!bp || !buffer_mapped(bp))
return 0;
typ = ((struct vxfs_typed *)bp->b_data) +

2
fs/freevxfs/vxfs_inode.c
View File

@ -99,7 +99,7 @@ vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
bp = sb_bread(sbp, block);
if (buffer_mapped(bp)) {
if (bp && buffer_mapped(bp)) {
struct vxfs_inode_info *vip;
struct vxfs_dinode *dip;