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[Qemu-devel] [PATCH] ide: Fix error messages from static code analysis (
From: |
Stefan Weil |
Subject: |
[Qemu-devel] [PATCH] ide: Fix error messages from static code analysis (no real error) |
Date: |
Mon, 3 Sep 2012 22:13:56 +0200 |
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 <address@hidden>
---
Note: scripts/checkpatch.pl reports warnings and errors caused by tabs and
wrong indentation. I did not fix that because the whole file is full of tabs.
- sw
hw/ide/core.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 978dd5e..dc04621 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -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];
--
1.7.10
- [Qemu-devel] [PATCH] ide: Fix error messages from static code analysis (no real error),
Stefan Weil <=