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i4l: silence compiler warnings for array access in Eicon DIVA ISDN driver

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When compiling this driver, the compiler throws the following warnings:

drivers/isdn/hardware/eicon/message.c:8426: warning: array subscript is above array bounds
drivers/isdn/hardware/eicon/message.c:8427: warning: array subscript is above array bounds
drivers/isdn/hardware/eicon/message.c:8434: warning: array subscript is above array bounds
drivers/isdn/hardware/eicon/message.c:8435: warning: array subscript is above array bounds
drivers/isdn/hardware/eicon/message.c:8436: warning: array subscript is above array bounds
drivers/isdn/hardware/eicon/message.c:8447: warning: array subscript is above array bounds

This arises from the particular semantics the driver is using to write to
the nlc array (static byte[256]).  The array has a length in byte 0
followed by a T30_INFO struct starting at byte 1.

The T30_INFO struct has a number of variable length strings after the
station_id entry, which cannot be explicitly defined in the struct and the
driver accesses them with an array index to station_id beyond the length
of station_id.

This patch merely changes the semantics that the driver uses to access the
entries after the station_id entry to use the original 256 byte nlc array
taking the offset and length of the station_id entry to calculate where to
write in the array, thereby silencing the warning.

Signed-off-by: Ian Munsie <imunsie@au.ibm.com>
Cc: Armin Schindler <mac@melware.de>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: Stoyan Gaydarov <sgayda2@uiuc.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ian Munsie 2010-03-11 12:07:24 +00:00 committed by David S. Miller
parent dec9951b8a
commit 8b4017d8c1
1 changed files with 7 additions and 8 deletions
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15
drivers/isdn/hardware/eicon/message.c
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@ -8423,17 +8423,17 @@ static word add_b23(PLCI *plci, API_PARSE *bp)
pos = 0;
else
{
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ' ';
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ' ';
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ' ';
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ' ';
len = (byte)b3_config_parms[2].length;
if (len > 20)
len = 20;
if (CAPI_MAX_DATE_TIME_LENGTH + 2 + len + 2 + b3_config_parms[3].length <= CAPI_MAX_HEAD_LINE_SPACE)
{
for (i = 0; i < len; i++)
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ((byte *)b3_config_parms[2].info)[1+i];
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ' ';
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ' ';
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ((byte *)b3_config_parms[2].info)[1+i];
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ' ';
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ' ';
}
}
}
@ -8444,9 +8444,8 @@ static word add_b23(PLCI *plci, API_PARSE *bp)
((T30_INFO *)&nlc[1])->head_line_len = (byte)(pos + len);
nlc[0] += (byte)(pos + len);
for (i = 0; i < len; i++)
((T30_INFO *)&nlc[1])->station_id[20 + pos++] = ((byte *)b3_config_parms[3].info)[1+i];
}
else
nlc[1 + offsetof(T30_INFO, station_id) + 20 + pos++] = ((byte *)b3_config_parms[3].info)[1+i];
} else
((T30_INFO *)&nlc[1])->head_line_len = 0;
plci->nsf_control_bits = 0;