OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

panasonic-laptop: avoid overflow in acpi_pcc_hotkey_add() 

num_sifr could go negative since acpi_pcc_get_sqty() returns -EINVAL
on error.  Then it could bypass the sanity check (num_sifr > 255).
The subsequent call to kzalloc() would allocate a small buffer, leading
to a memory corruption.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Xi Wang 2011-12-28 23:49:06 -05:00 committed by Matthew Garrett
parent 461e74377c
commit e424fb8cc4
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/platform/x86/panasonic-laptop.c
View File

@ -562,8 +562,8 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
num_sifr = acpi_pcc_get_sqty(device);
if (num_sifr > 255) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
if (num_sifr < 0 || num_sifr > 255) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
return -ENODEV;
}