From: Rafael J. Wysocki Date: Wed, 13 Jun 2007 18:45:18 +0000 (+0900) Subject: sysfs: Fix oops in sysfs_drop_dentry on x86_64 X-Git-Tag: firefly_0821_release~28303^2~12 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9d9307dabb3de8140fb3801bf6eb01f231dbd83d;p=firefly-linux-kernel-4.4.55.git sysfs: Fix oops in sysfs_drop_dentry on x86_64 Fix oops on x86_64 caused by the dereference of dir in sysfs_drop_dentry() made before checking if dir is not NULL (cf. http://marc.info/?l=linux-kernel&m=118151626704924&w=2). Signed-off-by: Rafael J. Wysocki Signed-off-by: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index 732fd7f371e0..ee31bf369a88 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -285,7 +285,7 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd) int sysfs_hash_and_remove(struct dentry * dir, const char * name) { struct sysfs_dirent **pos, *sd; - struct sysfs_dirent *parent_sd = dir->d_fsdata; + struct sysfs_dirent *parent_sd; int found = 0; if (!dir) @@ -295,6 +295,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name) /* no inode means this hasn't been made visible yet */ return -ENOENT; + parent_sd = dir->d_fsdata; mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); for (pos = &parent_sd->s_children; *pos; pos = &(*pos)->s_sibling) { sd = *pos;