[ofa-general] drivers/infiniband/hw/cxgb3/iwch_provider.c: uninitialized variable used
Adrian Bunk
bunk at stusta.de
Mon Mar 19 02:26:55 PDT 2007
The Coverity checker spotted that "npages" will be used uninitialized in
the following code if !(mr_rereg_mask & IB_MR_REREG_TRANS):
<-- snip -->
...
static int iwch_reregister_phys_mem(struct ib_mr *mr,
int mr_rereg_mask,
struct ib_pd *pd,
struct ib_phys_buf *buffer_list,
int num_phys_buf,
int acc, u64 * iova_start)
{
struct iwch_mr mh, *mhp;
struct iwch_pd *php;
struct iwch_dev *rhp;
__be64 *page_list = NULL;
int shift = 0;
u64 total_size;
int npages;
int ret;
PDBG("%s ib_mr %p ib_pd %p\n", __FUNCTION__, mr, pd);
/* There can be no memory windows */
if (atomic_read(&mr->usecnt))
return -EINVAL;
mhp = to_iwch_mr(mr);
rhp = mhp->rhp;
php = to_iwch_pd(mr->pd);
/* make sure we are on the same adapter */
if (rhp != php->rhp)
return -EINVAL;
memcpy(&mh, mhp, sizeof *mhp);
if (mr_rereg_mask & IB_MR_REREG_PD)
php = to_iwch_pd(pd);
if (mr_rereg_mask & IB_MR_REREG_ACCESS)
mh.attr.perms = iwch_ib_to_tpt_access(acc);
if (mr_rereg_mask & IB_MR_REREG_TRANS)
ret = build_phys_page_list(buffer_list, num_phys_buf,
iova_start,
&total_size, &npages,
&shift, &page_list);
ret = iwch_reregister_mem(rhp, php, &mh, shift, page_list, npages);
...
<-- snip -->
Looking at the code, it also seems some orignally planned error handling
code for the build_phys_page_list() call was forgotten ("ret" is never
checked before it's overwritten again).
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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