From b31c94a60c841f61572c7f27afda1f688573f4c2 Mon Sep 17 00:00:00 2001 From: ArchStacker Date: Thu, 17 Sep 2015 11:19:53 +0800 Subject: [PATCH] Add check when store disk cache --- grub-core/kern/disk.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/grub-core/kern/disk.c b/grub-core/kern/disk.c index 789f8c0..acd0894 100644 --- a/grub-core/kern/disk.c +++ b/grub-core/kern/disk.c @@ -124,10 +124,12 @@ grub_disk_cache_store (unsigned long dev_id, unsigned long disk_id, cache_index = grub_disk_cache_get_index (dev_id, disk_id, sector); cache = grub_disk_cache_table + cache_index; + if(cache->lock) + return GRUB_ERR_NONE; + cache->lock = 1; grub_free (cache->data); cache->data = 0; - cache->lock = 0; cache->data = grub_malloc (GRUB_DISK_SECTOR_SIZE << GRUB_DISK_CACHE_BITS); if (! cache->data) @@ -138,6 +140,7 @@ grub_disk_cache_store (unsigned long dev_id, unsigned long disk_id, cache->dev_id = dev_id; cache->disk_id = disk_id; cache->sector = sector; + cache->lock = 0; return GRUB_ERR_NONE; } -- 2.4.3