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[Qemu-commits] [COMMIT c1e950c] Improve block range checks
From: |
Anthony Liguori |
Subject: |
[Qemu-commits] [COMMIT c1e950c] Improve block range checks |
Date: |
Fri, 08 May 2009 21:05:43 -0000 |
From: Kevin Wolf <address@hidden>
This patch makes the range checks for block requests more strict: It fixes a
potential integer overflow and checks for negative offsets. Also, it adds the
check for compressed writes.
Signed-off-by: Kevin Wolf <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
diff --git a/block.c b/block.c
index 3d1223d..acb8976 100644
--- a/block.c
+++ b/block.c
@@ -578,7 +578,10 @@ static int bdrv_check_byte_request(BlockDriverState *bs,
int64_t offset,
len = bdrv_getlength(bs);
- if ((offset + size) > len)
+ if (offset < 0)
+ return -EIO;
+
+ if ((offset > len) || (len - offset < size))
return -EIO;
return 0;
@@ -1150,6 +1153,8 @@ int bdrv_write_compressed(BlockDriverState *bs, int64_t
sector_num,
return -ENOMEDIUM;
if (!drv->bdrv_write_compressed)
return -ENOTSUP;
+ if (bdrv_check_request(bs, sector_num, nb_sectors))
+ return -EIO;
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
}
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