[PATCH] spufs: fix error handling in spufs_fill_dir()
From: Jeremy Kerr <jk@ozlabs.org>
Date: 2007-06-06 04:03:58
From: Sebastian Siewior <redacted> The error path in spufs_fill_dir() is broken. If d_alloc_name() or spufs_new_file() fails, spufs_prune_dir() is getting called. At this time dir->inode is not set and a NULL pointer is dereferenced by mutex_lock(). This bugfix replaces spufs_prune_dir() with a shorter version that does not touch dir->inode but simply removes all children. Signed-off-by: Sebastian Siewior <redacted> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Acked-by: Arnd Bergmann <redacted> --- Paulus - another bugfix for 2.6.22. --- arch/powerpc/platforms/cell/spufs/inode.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) Index: linux-2.6-spufs/arch/powerpc/platforms/cell/spufs/inode.c ===================================================================
--- linux-2.6-spufs.orig/arch/powerpc/platforms/cell/spufs/inode.c
+++ linux-2.6-spufs/arch/powerpc/platforms/cell/spufs/inode.c@@ -177,7 +177,7 @@ static int spufs_rmdir(struct inode *par static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files, int mode, struct spu_context *ctx) { - struct dentry *dentry; + struct dentry *dentry, *tmp; int ret; while (files->name && files->name[0]) {
@@ -193,7 +193,20 @@ static int spufs_fill_dir(struct dentry } return 0; out: - spufs_prune_dir(dir); + /* + * remove all children from dir. dir->inode is not set so don't + * just simply use spufs_prune_dir() and panic afterwards :) + * dput() looks like it will do the right thing: + * - dec parent's ref counter + * - remove child from parent's child list + * - free child's inode if possible + * - free child + */ + list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { + dput(dentry); + } + + shrink_dcache_parent(dir); return ret; }