[PATCH] drivers/scsi: Check NULL for kmalloc() return

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Verify that ch->dt is not NULL before using it:
ch-dt[elem] = value;

Signed-off-by: Davidlohr Bueso

---
 drivers/scsi/ch.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 7b1633a..96cbd20 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -353,6 +353,10 @@ ch_readconfig(scsi_changer *ch)
        /* look up the devices of the data transfer elements */
        ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
                         GFP_KERNEL);
+
+       if (!ch->dt)
+               return -ENOMEM;
+
        for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
                id  = -1;
                lun = 0;
--
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