From e4bb688d9f11d7fee927312cc97d443472c7c212 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Fri, 27 Apr 2007 03:08:13 +1000 Subject: [POWERPC] bootwrapper: Fix array handling in dt_xlate_reg(). This fixes a few bugs in how dt_xlate_reg() handles address arrays: 1. copy_val() was copying into the wrong end of the array, resulting in random stack garbage at the other end. 2. dt_xlate_reg() was getting the result from the wrong end of the array. 3. add_reg() and sub_reg() were treating the arrays as little-endian rather than big-endian. 4. add_reg() only returned an error on a carry out of the entire array, rather than out of the naddr portion. 5. The requested reg resource was checked to see if it exceeded the size of the reg property, but not to see if it exceeded the size of the buffer. Signed-off-by: Scott Wood Signed-off-by: Paul Mackerras --- arch/powerpc/boot/devtree.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) (limited to 'arch/powerpc/boot') diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c index 23492d7fb55..ac4b5ee92d5 100644 --- a/arch/powerpc/boot/devtree.c +++ b/arch/powerpc/boot/devtree.c @@ -123,15 +123,17 @@ static void get_reg_format(void *node, u32 *naddr, u32 *nsize) static void copy_val(u32 *dest, u32 *src, int naddr) { - memset(dest, 0, (MAX_ADDR_CELLS - naddr) * 4); - memcpy(dest, src, naddr * 4); + int pad = MAX_ADDR_CELLS - naddr; + + memset(dest, 0, pad * 4); + memcpy(dest + pad, src, naddr * 4); } static int sub_reg(u32 *reg, u32 *sub) { int i, borrow = 0; - for (i = 0; i < MAX_ADDR_CELLS; i++) { + for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) { int prev_borrow = borrow; borrow = reg[i] < sub[i] + prev_borrow; reg[i] -= sub[i] + prev_borrow; @@ -140,11 +142,11 @@ static int sub_reg(u32 *reg, u32 *sub) return !borrow; } -static int add_reg(u32 *reg, u32 *add) +static int add_reg(u32 *reg, u32 *add, int naddr) { int i, carry = 0; - for (i = 0; i < MAX_ADDR_CELLS; i++) { + for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) { u64 tmp = (u64)reg[i] + add[i] + carry; carry = tmp >> 32; reg[i] = (u32)tmp; @@ -228,7 +230,8 @@ int dt_xlate_reg(void *node, int res, unsigned long *addr, buflen = getprop(node, "reg", buf, sizeof(buf)) / 4; offset = (naddr + nsize) * res; - if (buflen < offset + naddr + nsize) + if (buflen < offset + naddr + nsize || + sizeof(buf) < offset + naddr + nsize) return 0; copy_val(last_addr, buf + offset, naddr); @@ -263,18 +266,14 @@ int dt_xlate_reg(void *node, int res, unsigned long *addr, copy_val(this_addr, buf + offset + prev_naddr, naddr); - if (!add_reg(last_addr, this_addr)) + if (!add_reg(last_addr, this_addr, naddr)) return 0; } if (naddr > 2) return 0; - ret_addr = last_addr[0]; - if (naddr == 2) { - ret_addr <<= 32; - ret_addr |= last_addr[1]; - } + ret_addr = ((u64)last_addr[2] << 32) | last_addr[3]; if (sizeof(void *) == 4 && (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL || -- cgit v1.2.3-70-g09d2