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Code

RDMA/bnxt_re: Fix a possible memory leak in the driver

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The GID context reuse logic requires the context memory to be
not freed if and when DEL_GID firmware command fails. But, if
there's no subsequent ADD_GID to reuse it, the context memory
must be freed when the driver is unloaded. Otherwise it leads
to a memory leak.

Below is the kmemleak trace reported:

unreferenced object 0xffff88817a4f34d0 (size 8):
  comm "insmod", pid 1072504, jiffies 4402561550
  hex dump (first 8 bytes):
  01 00 00 00 00 00 00 00                          ........
  backtrace (crc ccaa009e):
  __kmalloc_cache_noprof+0x33e/0x400
  0xffffffffc2db9d48
  add_modify_gid+0x5e0/0xb60 [ib_core]
  __ib_cache_gid_add+0x213/0x350 [ib_core]
  update_gid+0xf2/0x180 [ib_core]
  enum_netdev_ipv4_ips+0x3f3/0x690 [ib_core]
  enum_all_gids_of_dev_cb+0x125/0x1b0 [ib_core]
  ib_enum_roce_netdev+0x14b/0x250 [ib_core]
  ib_cache_setup_one+0x2e5/0x540 [ib_core]
  ib_register_device+0x82c/0xf10 [ib_core]
  0xffffffffc2df5ad9
  0xffffffffc2da8b07
  0xffffffffc2db174d
  auxiliary_bus_probe+0xa5/0x120
  really_probe+0x1e4/0x850
  __driver_probe_device+0x18f/0x3d0

Fixes: 4a62c5e9e2 ("RDMA/bnxt_re: Do not free the ctx_tbl entry if delete GID fails")
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/20250805101000.233310-4-kalesh-anakkur.purayil@broadcom.com
Reviewed-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Kalesh AP 2025-08-05 15:39:59 +05:30 committed by Leon Romanovsky
parent 666bce0bd7
commit ba60a1e8cb
1 changed files with 23 additions and 0 deletions
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23
drivers/infiniband/hw/bnxt_re/main.c
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@ -2017,6 +2017,28 @@ static void bnxt_re_free_nqr_mem(struct bnxt_re_dev *rdev)
rdev->nqr = NULL; rdev->nqr = NULL;
} }
/* When DEL_GID fails, driver is not freeing GID ctx memory.
* To avoid the memory leak, free the memory during unload
*/
static void bnxt_re_free_gid_ctx(struct bnxt_re_dev *rdev)
{
struct bnxt_qplib_sgid_tbl *sgid_tbl = &rdev->qplib_res.sgid_tbl;
struct bnxt_re_gid_ctx *ctx, **ctx_tbl;
int i;
if (!sgid_tbl->active)
return;
ctx_tbl = sgid_tbl->ctx;
for (i = 0; i < sgid_tbl->max; i++) {
if (sgid_tbl->hw_id[i] == 0xFFFF)
continue;
ctx = ctx_tbl[i];
kfree(ctx);
}
}
static void bnxt_re_dev_uninit(struct bnxt_re_dev *rdev, u8 op_type) static void bnxt_re_dev_uninit(struct bnxt_re_dev *rdev, u8 op_type)
{ {
u8 type; u8 type;
@ -2030,6 +2052,7 @@ static void bnxt_re_dev_uninit(struct bnxt_re_dev *rdev, u8 op_type)
if (test_and_clear_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags)) if (test_and_clear_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags))
cancel_delayed_work_sync(&rdev->worker); cancel_delayed_work_sync(&rdev->worker);
bnxt_re_free_gid_ctx(rdev);
if (test_and_clear_bit(BNXT_RE_FLAG_RESOURCES_INITIALIZED, if (test_and_clear_bit(BNXT_RE_FLAG_RESOURCES_INITIALIZED,
&rdev->flags)) &rdev->flags))
bnxt_re_cleanup_res(rdev); bnxt_re_cleanup_res(rdev);