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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2007-03-07 20:41:07 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-08 07:38:21 -0800
commitbca271136f06514253aa28c24c04fc23b88e971e (patch)
tree00b8bd4d3d929f682e6bffa12079d366d61deb11 /fs/hostfs/hostfs_kern.c
parent0ce3c83a9c22f59937b86c80b478dfbffe54dbab (diff)
downloadop-kernel-dev-bca271136f06514253aa28c24c04fc23b88e971e.zip
op-kernel-dev-bca271136f06514253aa28c24c04fc23b88e971e.tar.gz
[PATCH] uml: hostfs: fix double free
Fix double free in the error path - when name is assigned into root_inode we do not own it any more and we must not kfree() it - see patch for details. Thanks to William Stearns for the initial report. CC: William Stearns <wstearns@pobox.com> Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hostfs/hostfs_kern.c')
-rw-r--r--fs/hostfs/hostfs_kern.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index e965eb1..6f10e43 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -966,6 +966,9 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
goto out_put;
HOSTFS_I(root_inode)->host_filename = name;
+ /* Avoid that in the error path, iput(root_inode) frees again name through
+ * hostfs_destroy_inode! */
+ name = NULL;
err = -ENOMEM;
sb->s_root = d_alloc_root(root_inode);
@@ -977,7 +980,7 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
/* No iput in this case because the dput does that for us */
dput(sb->s_root);
sb->s_root = NULL;
- goto out_free;
+ goto out;
}
return(0);
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