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@@ -72,7 +72,7 @@ nouveau_bios_shadow_of(struct nouveau_bios *bios)
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}
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data = of_get_property(dn, "NVDA,BMP", &size);
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- if (data) {
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+ if (data && size) {
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bios->size = size;
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bios->data = kmalloc(bios->size, GFP_KERNEL);
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if (bios->data)
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@@ -104,6 +104,9 @@ nouveau_bios_shadow_pramin(struct nouveau_bios *bios)
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goto out;
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bios->size = nv_rd08(bios, 0x700002) * 512;
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+ if (!bios->size)
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+ goto out;
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+
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bios->data = kmalloc(bios->size, GFP_KERNEL);
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if (bios->data) {
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for (i = 0; i < bios->size; i++)
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@@ -155,6 +158,9 @@ nouveau_bios_shadow_prom(struct nouveau_bios *bios)
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/* read entire bios image to system memory */
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bios->size = nv_rd08(bios, 0x300002) * 512;
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+ if (!bios->size)
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+ goto out;
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+
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bios->data = kmalloc(bios->size, GFP_KERNEL);
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if (bios->data) {
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for (i = 0; i < bios->size; i++)
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@@ -186,14 +192,22 @@ nouveau_bios_shadow_acpi(struct nouveau_bios *bios)
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{
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struct pci_dev *pdev = nv_device(bios)->pdev;
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int ret, cnt, i;
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- u8 data[3];
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- if (!nouveau_acpi_rom_supported(pdev))
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+ if (!nouveau_acpi_rom_supported(pdev)) {
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+ bios->data = NULL;
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return;
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+ }
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bios->size = 0;
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- if (nouveau_acpi_get_bios_chunk(data, 0, 3) == 3)
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- bios->size = data[2] * 512;
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+ bios->data = kmalloc(4096, GFP_KERNEL);
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+ if (bios->data) {
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+ if (nouveau_acpi_get_bios_chunk(bios->data, 0, 4096) == 4096)
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+ bios->size = bios->data[2] * 512;
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+ kfree(bios->data);
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+ }
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+
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+ if (!bios->size)
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+ return;
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bios->data = kmalloc(bios->size, GFP_KERNEL);
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for (i = 0; bios->data && i < bios->size; i += cnt) {
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@@ -229,12 +243,14 @@ nouveau_bios_shadow_pci(struct nouveau_bios *bios)
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static int
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nouveau_bios_score(struct nouveau_bios *bios, const bool writeable)
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{
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- if (!bios->data || bios->data[0] != 0x55 || bios->data[1] != 0xAA) {
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+ if (bios->size < 3 || !bios->data || bios->data[0] != 0x55 ||
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+ bios->data[1] != 0xAA) {
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nv_info(bios, "... signature not found\n");
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return 0;
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}
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- if (nvbios_checksum(bios->data, bios->data[2] * 512)) {
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+ if (nvbios_checksum(bios->data,
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+ min_t(u32, bios->data[2] * 512, bios->size))) {
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nv_info(bios, "... checksum invalid\n");
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/* if a ro image is somewhat bad, it's probably all rubbish */
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return writeable ? 2 : 1;
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