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rtlsdr_set_sample_rate(): don't access dev structure before checking for NULL 

Thanks to Derek Lieber for reporting this bug.

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Steve Markgraf 2013-01-02 20:19:19 +01:00
parent 314683a51e
commit 4b057fea0f
1 changed files with 2 additions and 3 deletions
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5
src/librtlsdr.c
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@ -965,7 +965,6 @@ int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
uint16_t tmp;
uint32_t rsamp_ratio;
double real_rate;
uint32_t rtl_freq = dev->rtl_xtal;
if (!dev)
return -1;
@ -974,10 +973,10 @@ int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
if (samp_rate > MAX_SAMP_RATE)
samp_rate = MAX_SAMP_RATE;
rsamp_ratio = (rtl_freq * TWO_POW(22)) / samp_rate;
rsamp_ratio = (dev->rtl_xtal * TWO_POW(22)) / samp_rate;
rsamp_ratio &= ~3;
real_rate = (rtl_freq * TWO_POW(22)) / rsamp_ratio;
real_rate = (dev->rtl_xtal * TWO_POW(22)) / rsamp_ratio;
if ( ((double)samp_rate) != real_rate )
fprintf(stderr, "Exact sample rate is: %f Hz\n", real_rate);