From b00917be6e90149286b3680f5e626787bcc75c55 Mon Sep 17 00:00:00 2001 From: Dmitry Eremin Date: Wed, 4 Nov 2015 13:40:01 -0500 Subject: [PATCH] staging: lustre: Fix possible NULL pointer dereference in lprocfs_status.c The imp->imp_connection really could be NULL, we better check for it before dereferencing it in taht call to libcfs_nid2str_r. Signed-off-by: Dmitry Eremin Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6507 Reviewed-on: http://review.whamcloud.com/14808 Reviewed-by: Bob Glossman Reviewed-by: John L. Hammond Reviewed-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/obdclass/lprocfs_status.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c index 2de3c1b6fa49..dda5ad105f2e 100644 --- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c +++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c @@ -665,15 +665,18 @@ int lprocfs_rd_import(struct seq_file *m, void *data) seq_printf(m, "%s%s", j ? ", " : "", nidstr); j++; } - libcfs_nid2str_r(imp->imp_connection->c_peer.nid, - nidstr, sizeof(nidstr)); + if (imp->imp_connection != NULL) + libcfs_nid2str_r(imp->imp_connection->c_peer.nid, + nidstr, sizeof(nidstr)); + else + strncpy(nidstr, "", sizeof(nidstr)); seq_printf(m, "]\n" " current_connection: %s\n" " connection_attempts: %u\n" " generation: %u\n" " in-progress_invalidations: %u\n", - imp->imp_connection == NULL ? "" : nidstr, + nidstr, imp->imp_conn_cnt, imp->imp_generation, atomic_read(&imp->imp_inval_count)); -- 2.30.2