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gadget: f_thor: check pointers before use in download_tail()

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Some pointers in function download_tail() were not checked
before the use. This could possibly cause the data abort.
To avoid this, check if the pointers are not null is added.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
[TestHW: Exynos4412-Trats2]
This commit is contained in:
Przemyslaw Marczak 2014-12-15 10:34:10 +01:00 committed by Lukasz Majewski
parent 7da6fa2716
commit 62a96d805f
1 changed files with 14 additions and 2 deletions
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16
drivers/usb/gadget/f_thor.c
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@ -205,12 +205,24 @@ static long long int download_head(unsigned long long total,
static int download_tail(long long int left, int cnt)
{
struct dfu_entity *dfu_entity = dfu_get_entity(alt_setting_num);
void *transfer_buffer = dfu_get_buf(dfu_entity);
struct dfu_entity *dfu_entity;
void *transfer_buffer;
int ret;
debug("%s: left: %llu cnt: %d\n", __func__, left, cnt);
dfu_entity = dfu_get_entity(alt_setting_num);
if (!dfu_entity) {
error("Alt setting: %d entity not found!\n", alt_setting_num);
return -ENOENT;
}
transfer_buffer = dfu_get_buf(dfu_entity);
if (!transfer_buffer) {
error("Transfer buffer not allocated!");
return -ENXIO;
}
if (left) {
ret = dfu_write(dfu_entity, transfer_buffer, left, cnt++);
if (ret) {