Patch "RDMA/restrack: Fix potential invalid address access" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    RDMA/restrack: Fix potential invalid address access

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rdma-restrack-fix-potential-invalid-address-access.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 85492d38524796ba4135bfdcc292167edc667975
Author: Wenchao Hao <haowenchao2@xxxxxxxxxx>
Date:   Mon Mar 18 17:23:20 2024 +0800

    RDMA/restrack: Fix potential invalid address access
    
    [ Upstream commit ca537a34775c103f7b14d7bbd976403f1d1525d8 ]
    
    struct rdma_restrack_entry's kern_name was set to KBUILD_MODNAME
    in ib_create_cq(), while if the module exited but forgot del this
    rdma_restrack_entry, it would cause a invalid address access in
    rdma_restrack_clean() when print the owner of this rdma_restrack_entry.
    
    These code is used to help find one forgotten PD release in one of the
    ULPs. But it is not needed anymore, so delete them.
    
    Signed-off-by: Wenchao Hao <haowenchao2@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240318092320.1215235-1-haowenchao2@xxxxxxxxxx
    Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index 01a499a8b88db..438ed35881752 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -37,22 +37,6 @@ int rdma_restrack_init(struct ib_device *dev)
 	return 0;
 }
 
-static const char *type2str(enum rdma_restrack_type type)
-{
-	static const char * const names[RDMA_RESTRACK_MAX] = {
-		[RDMA_RESTRACK_PD] = "PD",
-		[RDMA_RESTRACK_CQ] = "CQ",
-		[RDMA_RESTRACK_QP] = "QP",
-		[RDMA_RESTRACK_CM_ID] = "CM_ID",
-		[RDMA_RESTRACK_MR] = "MR",
-		[RDMA_RESTRACK_CTX] = "CTX",
-		[RDMA_RESTRACK_COUNTER] = "COUNTER",
-		[RDMA_RESTRACK_SRQ] = "SRQ",
-	};
-
-	return names[type];
-};
-
 /**
  * rdma_restrack_clean() - clean resource tracking
  * @dev:  IB device
@@ -60,47 +44,14 @@ static const char *type2str(enum rdma_restrack_type type)
 void rdma_restrack_clean(struct ib_device *dev)
 {
 	struct rdma_restrack_root *rt = dev->res;
-	struct rdma_restrack_entry *e;
-	char buf[TASK_COMM_LEN];
-	bool found = false;
-	const char *owner;
 	int i;
 
 	for (i = 0 ; i < RDMA_RESTRACK_MAX; i++) {
 		struct xarray *xa = &dev->res[i].xa;
 
-		if (!xa_empty(xa)) {
-			unsigned long index;
-
-			if (!found) {
-				pr_err("restrack: %s", CUT_HERE);
-				dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
-			}
-			xa_for_each(xa, index, e) {
-				if (rdma_is_kernel_res(e)) {
-					owner = e->kern_name;
-				} else {
-					/*
-					 * There is no need to call get_task_struct here,
-					 * because we can be here only if there are more
-					 * get_task_struct() call than put_task_struct().
-					 */
-					get_task_comm(buf, e->task);
-					owner = buf;
-				}
-
-				pr_err("restrack: %s %s object allocated by %s is not freed\n",
-				       rdma_is_kernel_res(e) ? "Kernel" :
-							       "User",
-				       type2str(e->type), owner);
-			}
-			found = true;
-		}
+		WARN_ON(!xa_empty(xa));
 		xa_destroy(xa);
 	}
-	if (found)
-		pr_err("restrack: %s", CUT_HERE);
-
 	kfree(rt);
 }