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authorRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>2014-05-18 18:12:26 +0200
committerJiri Kosina <jkosina@suse.cz>2014-06-19 15:29:51 +0200
commiteaa015d2bfc85dcabb44184b6ef826361b993c4b (patch)
tree044ab3f914b30c090b29a00075f8ef21f012a30c
parent305af08c5398bab6c7029da53eb15d85a53eef0e (diff)
downloadlinux-eaa015d2bfc85dcabb44184b6ef826361b993c4b.tar.bz2
scsi: mvsas: mv_sas.c: Fix for possible null pointer dereference
There is otherwise a risk of a possible null pointer dereference. Was largely found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/scsi/mvsas/mv_sas.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index 6c1f223a8e1d..ac52f7c99513 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1344,19 +1344,23 @@ void mvs_dev_gone_notify(struct domain_device *dev)
{
unsigned long flags = 0;
struct mvs_device *mvi_dev = dev->lldd_dev;
- struct mvs_info *mvi = mvi_dev->mvi_info;
-
- spin_lock_irqsave(&mvi->lock, flags);
+ struct mvs_info *mvi;
- if (mvi_dev) {
- mv_dprintk("found dev[%d:%x] is gone.\n",
- mvi_dev->device_id, mvi_dev->dev_type);
- mvs_release_task(mvi, dev);
- mvs_free_reg_set(mvi, mvi_dev);
- mvs_free_dev(mvi_dev);
- } else {
+ if (!mvi_dev) {
mv_dprintk("found dev has gone.\n");
+ return;
}
+
+ mvi = mvi_dev->mvi_info;
+
+ spin_lock_irqsave(&mvi->lock, flags);
+
+ mv_dprintk("found dev[%d:%x] is gone.\n",
+ mvi_dev->device_id, mvi_dev->dev_type);
+ mvs_release_task(mvi, dev);
+ mvs_free_reg_set(mvi, mvi_dev);
+ mvs_free_dev(mvi_dev);
+
dev->lldd_dev = NULL;
mvi_dev->sas_device = NULL;