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ide: Fix error messages from static code analysis (no real error) 

Report from smatch:
hw/ide/core.c:1472 ide_exec_cmd(423) error: buffer overflow 'smart_attributes' 8 <= 29
hw/ide/core.c:1474 ide_exec_cmd(425) error: buffer overflow 'smart_attributes' 8 <= 29
hw/ide/core.c:1475 ide_exec_cmd(426) error: buffer overflow 'smart_attributes' 8 <= 29
...

The upper limit of 30 was never reached because both for loops terminated
when 'smart_attributes' reached end of list, so there was no real buffer
overflow.

Nevertheless, changing the code not only fixes the error report, but also
reduces the size of smart_attributes and simplifies the for loops.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Weil 2012-09-03 22:13:56 +02:00 committed by Kevin Wolf
parent ce560dcf20
commit 1e53537fda
1 changed files with 2 additions and 9 deletions
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11
hw/ide/core.c
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@ -53,8 +53,6 @@ static const int smart_attributes[][12] = {
{ 0x0c, 0x03, 0x00, 0x64, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
/* airflow-temperature-celsius */
{ 190, 0x03, 0x00, 0x45, 0x45, 0x1f, 0x00, 0x1f, 0x1f, 0x00, 0x00, 0x32},
/* end of list */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
};
static int ide_handle_rw_error(IDEState *s, int error, int op);
@ -1468,9 +1466,7 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
case SMART_READ_THRESH:
memset(s->io_buffer, 0, 0x200);
s->io_buffer[0] = 0x01; /* smart struct version */
for (n=0; n<30; n++) {
if (smart_attributes[n][0] == 0)
break;
for (n = 0; n < ARRAY_SIZE(smart_attributes); n++) {
s->io_buffer[2+0+(n*12)] = smart_attributes[n][0];
s->io_buffer[2+1+(n*12)] = smart_attributes[n][11];
}
@ -1484,10 +1480,7 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val)
case SMART_READ_DATA:
memset(s->io_buffer, 0, 0x200);
s->io_buffer[0] = 0x01; /* smart struct version */
for (n=0; n<30; n++) {
if (smart_attributes[n][0] == 0) {
break;
}
for (n = 0; n < ARRAY_SIZE(smart_attributes); n++) {
int i;
for(i = 0; i < 11; i++) {
s->io_buffer[2+i+(n*12)] = smart_attributes[n][i];