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staging/lustre/mdc: Initialize req in mdc_enqueue for !it case 

Commit ab909585b8 ("staging: lustre: Cleanup variable declarations
in mdc_enqueue()") broke Lustre flock handling introducing access
to uninitialized req variable, leading to bizzare crash in a later
call to __req_capsule_offset with invalid pill value.

Set req to NULL just for this case as in all other cases req is
explicitly initialized with request packing call.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
CC: Srikrishan Malik <srikrishanmalik@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2015-02-01 21:52:19 -05:00 committed by Greg Kroah-Hartman
parent 431b567856
commit 3a09f36efd
1 changed files with 1 additions and 0 deletions
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drivers/staging/lustre/lustre/mdc/mdc_locks.c
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@ -828,6 +828,7 @@ resend:
einfo->ei_type); einfo->ei_type);
policy = (ldlm_policy_data_t *)lmm; policy = (ldlm_policy_data_t *)lmm;
res_id.name[3] = LDLM_FLOCK; res_id.name[3] = LDLM_FLOCK;
req = NULL;
} else if (it->it_op & IT_OPEN) { } else if (it->it_op & IT_OPEN) {
req = mdc_intent_open_pack(exp, it, op_data, lmm, lmmsize, req = mdc_intent_open_pack(exp, it, op_data, lmm, lmmsize,
einfo->ei_cbdata); einfo->ei_cbdata);