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[Qemu-devel] [PATCH] block/vdi: Allow disk images of size 0
From: |
Stefan Weil |
Subject: |
[Qemu-devel] [PATCH] block/vdi: Allow disk images of size 0 |
Date: |
Thu, 6 May 2010 20:53:47 +0200 |
Even it is not very useful, users may create images of size 0.
Without the special option CONFIG_ZERO_MALLOC, qemu_mallocz
aborts execution when it is told to allocate 0 bytes,
so avoid this kind of call.
Cc: Kevin Wolf <address@hidden>
Signed-off-by: Stefan Weil <address@hidden>
---
block/vdi.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/block/vdi.c b/block/vdi.c
index 2213819..02b9fea 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -435,7 +435,9 @@ static int vdi_open(BlockDriverState *bs, int flags)
bmap_size = header.blocks_in_image * sizeof(uint32_t);
bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
- s->bmap = qemu_malloc(bmap_size * SECTOR_SIZE);
+ if (bmap_size > 0) {
+ s->bmap = qemu_malloc(bmap_size * SECTOR_SIZE);
+ }
if (bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) <
0) {
goto fail_free_bmap;
}
@@ -860,7 +862,10 @@ static int vdi_create(const char *filename,
QEMUOptionParameter *options)
result = -errno;
}
- bmap = (uint32_t *)qemu_mallocz(bmap_size);
+ bmap = NULL;
+ if (bmap_size > 0) {
+ bmap = (uint32_t *)qemu_mallocz(bmap_size);
+ }
for (i = 0; i < blocks; i++) {
if (image_type == VDI_TYPE_STATIC) {
bmap[i] = i;
--
1.7.0
- [Qemu-devel] [PATCH] block/vdi: Allow disk images of size 0,
Stefan Weil <=