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Fix divide by zero crash

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When called with 0 symbol rate the module would crash with a divide by
zero error.
Added simple symbol rate validation
This commit is contained in:
Pedro Pinhão 2015-01-29 23:19:53 +01:00
parent fb02f4f239
commit cab67860a5
1 changed files with 18 additions and 0 deletions
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18
packages/linux/patches/3.18.4/linux-227-ds3000-invalid-symbol-rate.patch vendored Normal file
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@ -0,0 +1,18 @@
diff -rupN a/drivers/media/dvb-frontends/ds3000.c b/drivers/media/dvb-frontends/ds3000.c
--- a/drivers/media/dvb-frontends/ds3000.c 2015-01-28 23:24:59.000000000 +0100
+++ b/drivers/media/dvb-frontends/ds3000.c 2015-01-29 21:57:56.000000000 +0100
@@ -958,6 +958,14 @@ static int ds3000_set_frontend(struct dv
/* enable ac coupling */
ds3000_writereg(state, 0x25, 0x8a);
+ dprintk("%s() frequency:%u symbol_rate:%u\n", __func__, c->frequency, c->symbol_rate);
+
+ if (c->symbol_rate < ds3000_ops.info.symbol_rate_min || c->symbol_rate > ds3000_ops.info.symbol_rate_max ) {
+ dprintk("%s() symbol_rate %u out of range (%u ... %u)\n", __func__, c->symbol_rate,
+ ds3000_ops.info.symbol_rate_min, ds3000_ops.info.symbol_rate_max);
+ return 1;
+ }
+
/* enhance symbol rate performance */
if ((c->symbol_rate / 1000) <= 5000) {
value = 29777 / (c->symbol_rate / 1000) + 1;