From 761c5a69751967f4fe7430eb65b3a0ea92f3b673 Mon Sep 17 00:00:00 2001 From: Marcin Slusarz Date: Mon, 15 Feb 2010 23:24:49 +0100 Subject: [PATCH] drm/nouveau: fix i2ctable bounds checking i2c_entries seems to be the number of i2c entries, so with index equal to this number, we could read invalid data from i2ctable. Fix it. Signed-off-by: Marcin Slusarz Signed-off-by: Francisco Jerez Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_bios.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c index c1cee91..ef2fe96 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bios.c +++ b/drivers/gpu/drm/nouveau/nouveau_bios.c @@ -4984,7 +4984,8 @@ read_dcb_i2c_entry(struct drm_device *dev, int dcb_version, uint8_t *i2ctable, i else NV_WARN(dev, "DCB I2C table has more entries than indexable " - "(%d entries, max index 15)\n", i2ctable[2]); + "(%d entries, max %d)\n", i2ctable[2], + DCB_MAX_NUM_I2C_ENTRIES); entry_len = i2ctable[3]; /* [4] is i2c_default_indices, read in parse_dcb_table() */ } @@ -5000,8 +5001,8 @@ read_dcb_i2c_entry(struct drm_device *dev, int dcb_version, uint8_t *i2ctable, i if (index == 0xf) return 0; - if (index > i2c_entries) { - NV_ERROR(dev, "DCB I2C index too big (%d > %d)\n", + if (index >= i2c_entries) { + NV_ERROR(dev, "DCB I2C index too big (%d >= %d)\n", index, i2ctable[2]); return -ENOENT; } -- 2.7.4