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vtophys: fix uninitialized variable read on mem unregister

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spdk_mem_map_translate() inside the vtophys unregister
callback could potentially read unitialized variable.

This isn't critical since vtophys mem map doesn't yet
implement the callback for checking mem contiguity and
the spdk_mem_map_translate() was exiting early - before
the unitialized variable was actually processed. It was
still technically dereferenced though, which is a bug.

Change-Id: I2af52e6f41bee35528c3d771aafd9c768c9d2fc7
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/c/438445
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: wuzhouhui <wuzhouhui@kingsoft.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Darek Stojaczyk 2018-12-28 11:18:17 +01:00 committed by Jim Harris
parent ec5972cb0d
commit 668c8c57be
1 changed files with 1 additions and 1 deletions
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2
lib/env_dpdk/vtophys.c
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@ -400,7 +400,7 @@ spdk_vtophys_notify(void *cb_ctx, struct spdk_mem_map *map,
* we need to unmap the range from the IOMMU
*/
if (g_vfio.enabled) {
uint64_t buffer_len;
uint64_t buffer_len = VALUE_2MB;
paddr = spdk_mem_map_translate(map, (uint64_t)vaddr, &buffer_len);
if (buffer_len != VALUE_2MB) {
return -EINVAL;