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staging: lustre: fix potential NULL pointer dereference 

The rest of the code seem to imply that rmf_dumper may indeed be
NULL.  Change the code so that dumping is not even considered if
rmf_dumper callback is not set.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michal Nazarewicz 2013-11-29 18:10:59 +01:00 committed by Greg Kroah-Hartman
parent 14f4f4aa90
commit 358bd68cbd
1 changed files with 6 additions and 3 deletions
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9
drivers/staging/lustre/lustre/ptlrpc/layout.c
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@ -1882,8 +1882,11 @@ swabber_dumper_helper(struct req_capsule *pill,
else
do_swab = 0;
if (!field->rmf_dumper)
dump = 0;
if (!(field->rmf_flags & RMF_F_STRUCT_ARRAY)) {
if (dump && field->rmf_dumper) {
if (dump) {
CDEBUG(D_RPCTRACE, "Dump of %sfield %s follows\n",
do_swab ? "unswabbed " : "", field->rmf_name);
field->rmf_dumper(value);
@ -1909,7 +1912,7 @@ swabber_dumper_helper(struct req_capsule *pill,
for (p = value, i = 0, n = len / field->rmf_size;
i < n;
i++, p += field->rmf_size) {
if (dump && field->rmf_dumper) {
if (dump) {
CDEBUG(D_RPCTRACE, "Dump of %sarray field %s, "
"element %d follows\n",
do_swab ? "unswabbed " : "", field->rmf_name, i);
@ -1918,7 +1921,7 @@ swabber_dumper_helper(struct req_capsule *pill,
if (!do_swab)
continue;
swabber(p);
if (dump && field->rmf_dumper) {
if (dump) {
CDEBUG(D_RPCTRACE, "Dump of swabbed array field %s, "
"element %d follows\n", field->rmf_name, i);
field->rmf_dumper(value);