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[PATCH] dvb: Fix integer overflow bug

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Fix integer overflow bug in read_signal_strength() reported by Anthony
Leclerc.

Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Johannes Stezenbach 2005-11-08 21:35:25 -08:00 committed by Linus Torvalds
parent 5c15c0b4fa
commit b90ed914e5
2 changed files with 12 additions and 3 deletions
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7
drivers/media/dvb/frontends/or51132.c
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@ -468,6 +468,7 @@ static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
unsigned char snd_buf[2];
u8 rcvr_stat;
u16 snr_equ;
u32 signal_strength;
int usK;
snd_buf[0]=0x04;
@ -503,7 +504,11 @@ static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
usK = (rcvr_stat & 0x10) ? 3 : 0;
/* The value reported back from the frontend will be FFFF=100% 0000=0% */
*strength = (((8952 - i20Log10(snr_equ) - usK*100)/3+5)*65535)/1000;
signal_strength = (((8952 - i20Log10(snr_equ) - usK*100)/3+5)*65535)/1000;
if (signal_strength > 0xffff)
*strength = 0xffff;
else
*strength = signal_strength;
dprintk("read_signal_strength %i\n",*strength);
return 0;

8
drivers/media/dvb/frontends/or51211.c
View File

@ -339,6 +339,7 @@ static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
u8 rec_buf[2];
u8 snd_buf[4];
u8 snr_equ;
u32 signal_strength;
/* SNR after Equalizer */
snd_buf[0] = 0x04;
@ -358,8 +359,11 @@ static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
snr_equ = rec_buf[0] & 0xff;
/* The value reported back from the frontend will be FFFF=100% 0000=0% */
*strength = (((5334 - i20Log10(snr_equ))/3+5)*65535)/1000;
signal_strength = (((5334 - i20Log10(snr_equ))/3+5)*65535)/1000;
if (signal_strength > 0xffff)
*strength = 0xffff;
else
*strength = signal_strength;
dprintk("read_signal_strength %i\n",*strength);
return 0;