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staging/sep: Check pointers before dereferencing (fix smatch warning)

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smatch complains about two dereferenced before check issues:

sep_main.c:2898 sep_free_dma_tables_and_dcb() warn: variable dereferenced before check
'dma_ctx' (see line 2885)
sep_main.c:2898 sep_free_dma_tables_and_dcb() warn: variable dereferenced before check
'*dma_ctx' (see line 2885)

-> Move the checks to the top, but keep the semantics.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Huewe 2013-02-19 13:07:28 +01:00 committed by Greg Kroah-Hartman
parent c37aeab625
commit eb1bd49c50
1 changed files with 3 additions and 2 deletions
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5
drivers/staging/sep/sep_main.c
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@ -2880,6 +2880,8 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
dev_dbg(&sep->pdev->dev, "[PID%d] sep_free_dma_tables_and_dcb\n",
current->pid);
if (!dma_ctx || !*dma_ctx) /* nothing to be done here*/
return 0;
if (((*dma_ctx)->secure_dma == false) && (isapplet == true)) {
dev_dbg(&sep->pdev->dev, "[PID%d] handling applet\n",
@ -2895,8 +2897,7 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
* Go over each DCB and see if
* tail pointer must be updated
*/
for (i = 0; dma_ctx && *dma_ctx &&
i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
for (i = 0; i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
if (dcb_table_ptr->out_vr_tail_pt) {
pt_hold = (unsigned long)dcb_table_ptr->
out_vr_tail_pt;