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author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2021-07-17 13:17:22 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 14:50:54 +0300 |
commit | 03acb0c5ac46b1aa5f3015f1e01243aff9e08600 (patch) | |
tree | 51b622e23f85de72a0f97ce3f4947a6b249fb0a5 /drivers/misc/sgi-gru/grumain.c | |
parent | 07e913418ce4ba5eb620dd4668bf91ec94e11136 (diff) | |
download | linux-03acb0c5ac46b1aa5f3015f1e01243aff9e08600.tar.xz |
misc: sgi-gru: Convert from atomic_t to refcount_t on gru_thread_state->ts_refcnt
refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.
Acked-by: Dimitri Sivanich <sivanich@hpe.com>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Link: https://lore.kernel.org/r/1626517043-42696-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/sgi-gru/grumain.c')
-rw-r--r-- | drivers/misc/sgi-gru/grumain.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c index 40ac59dd018c..9afda47efbf2 100644 --- a/drivers/misc/sgi-gru/grumain.c +++ b/drivers/misc/sgi-gru/grumain.c @@ -282,7 +282,7 @@ static void gru_unload_mm_tracker(struct gru_state *gru, */ void gts_drop(struct gru_thread_state *gts) { - if (gts && atomic_dec_return(>s->ts_refcnt) == 0) { + if (gts && refcount_dec_and_test(>s->ts_refcnt)) { if (gts->ts_gms) gru_drop_mmu_notifier(gts->ts_gms); kfree(gts); @@ -323,7 +323,7 @@ struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma, STAT(gts_alloc); memset(gts, 0, sizeof(struct gru_thread_state)); /* zero out header */ - atomic_set(>s->ts_refcnt, 1); + refcount_set(>s->ts_refcnt, 1); mutex_init(>s->ts_ctxlock); gts->ts_cbr_au_count = cbr_au_count; gts->ts_dsr_au_count = dsr_au_count; @@ -888,7 +888,7 @@ again: gts->ts_gru = gru; gts->ts_blade = gru->gs_blade_id; gts->ts_ctxnum = gru_assign_context_number(gru); - atomic_inc(>s->ts_refcnt); + refcount_inc(>s->ts_refcnt); gru->gs_gts[gts->ts_ctxnum] = gts; spin_unlock(&gru->gs_lock); |