From 30560ba6eda308c13a361d08eb5d4eaab94ab37e Mon Sep 17 00:00:00 2001 From: Jeff Moyer Date: Mon, 13 Feb 2006 14:52:38 -0800 Subject: [PATCH] firmware: fix BUG: in fw_realloc_buffer The fw_realloc_buffer routine does not handle an increase in buffer size of more than 4k. It's not clear to me why it expects that it will only get an extra 4k of data. The attached patch modifies fw_realloc_buffer to vmalloc as much memory as is requested, instead of what we previously had + 4k. I've tested this on my laptop, which would crash occaisionally on boot without the patch. With the patch, it hasn't crashed, but I can't be certain that this code path is exercised. Signed-off-by: Jeff Moyer Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/base/firmware_class.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/base') diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index e97e911ebf7a..472318205236 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -211,18 +211,20 @@ static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) { u8 *new_data; + int new_size = fw_priv->alloc_size; if (min_size <= fw_priv->alloc_size) return 0; - new_data = vmalloc(fw_priv->alloc_size + PAGE_SIZE); + new_size = ALIGN(min_size, PAGE_SIZE); + new_data = vmalloc(new_size); if (!new_data) { printk(KERN_ERR "%s: unable to alloc buffer\n", __FUNCTION__); /* Make sure that we don't keep incomplete data */ fw_load_abort(fw_priv); return -ENOMEM; } - fw_priv->alloc_size += PAGE_SIZE; + fw_priv->alloc_size = new_size; if (fw_priv->fw->data) { memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size); vfree(fw_priv->fw->data); -- cgit v1.2.3