From: Sebastian Siewior Date: Wed, 6 Jun 2007 04:03:58 +0000 (+1000) Subject: [POWERPC] spufs: Fix error handling in spufs_fill_dir() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=87873c86802ba7ff9d9550d06459a6e99d72c5eb;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [POWERPC] spufs: Fix error handling in spufs_fill_dir() 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 Signed-off-by: Jeremy Kerr Acked-by: Arnd Bergmann Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c index 083568139771..9807206e0219 100644 --- a/arch/powerpc/platforms/cell/spufs/inode.c +++ b/arch/powerpc/platforms/cell/spufs/inode.c @@ -177,7 +177,7 @@ static int spufs_rmdir(struct inode *parent, struct dentry *dir) 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 *dir, struct tree_descr *files, } 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; }