Just like the kernel, the fallback implementation of
xc_map_foreign_bulk() should clear the error indication array upon
success.
Also, a few allocations were needlessly using calloc() instead of
malloc().
Finally, in xc_domain_save() allocate the error indicator array once
(along with the other arrays) instead of using realloc() (without
error checking) in the loop body.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2010-01-06.orig/tools/libxc/xc_domain_save.c 2010-01-12
10:22:58.000000000 +0100
+++ 2010-01-06/tools/libxc/xc_domain_save.c 2010-01-22 08:33:52.000000000
+0100
@@ -1059,7 +1059,8 @@ int xc_domain_save(int xc_handle, int io
pfn_type = xg_memalign(PAGE_SIZE, ROUNDUP(
MAX_BATCH_SIZE * sizeof(*pfn_type), PAGE_SHIFT));
pfn_batch = calloc(MAX_BATCH_SIZE, sizeof(*pfn_batch));
- if ( (pfn_type == NULL) || (pfn_batch == NULL) )
+ pfn_err = malloc(MAX_BATCH_SIZE * sizeof(*pfn_err));
+ if ( (pfn_type == NULL) || (pfn_batch == NULL) || (pfn_err == NULL) )
{
ERROR("failed to alloc memory for pfn_type and/or pfn_batch arrays");
errno = ENOMEM;
@@ -1273,7 +1274,6 @@ int xc_domain_save(int xc_handle, int io
if ( batch == 0 )
goto skip; /* vanishingly unlikely... */
- pfn_err = realloc(pfn_err, sizeof(int) * batch);
region_base = xc_map_foreign_bulk(
xc_handle, dom, PROT_READ, pfn_type, pfn_err, batch);
if ( region_base == NULL )
--- 2010-01-06.orig/tools/libxc/xc_linux.c 2010-01-14 14:05:14.000000000
+0100
+++ 2010-01-06/tools/libxc/xc_linux.c 2010-01-22 08:38:41.000000000 +0100
@@ -186,7 +186,7 @@ void *xc_map_foreign_bulk(int xc_handle,
* IOCTL_PRIVCMD_MMAPBATCH_V2 is not supported - fall back to
* IOCTL_PRIVCMD_MMAPBATCH.
*/
- xen_pfn_t *pfn = calloc(num, sizeof(*pfn));
+ xen_pfn_t *pfn = malloc(num * sizeof(*pfn));
if ( pfn )
{
--- 2010-01-06.orig/tools/libxc/xc_misc.c 2010-01-08 15:38:59.000000000
+0100
+++ 2010-01-06/tools/libxc/xc_misc.c 2010-01-22 08:39:22.000000000 +0100
@@ -360,7 +360,7 @@ void *xc_map_foreign_pages(int xc_handle
return NULL;
}
- err = calloc(num, sizeof(*err));
+ err = malloc(num * sizeof(*err));
if (!err)
return NULL;
@@ -397,7 +397,7 @@ xc_map_foreign_bulk(int xc_handle, uint3
return NULL;
}
- pfn = calloc(num, sizeof(*pfn));
+ pfn = malloc(num * sizeof(*pfn));
if (!pfn) {
errno = ENOMEM;
return NULL;
@@ -416,7 +416,8 @@ xc_map_foreign_bulk(int xc_handle, uint3
err[i] = -EINVAL;
break;
}
- }
+ } else
+ memset(err, 0, num * sizeof(*err));
free(pfn);
xen-libxc-privcmd-mmap-clear.patch
Description: Text document
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