6.1-stable review patch. If anyone has any objections, please let me know.
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From: Chenghai Huang huangchenghai2@huawei.com
[ Upstream commit 8be0913389718e8d27c4f1d4537b5e1b99ed7739 ]
During the zip probe process, the debugfs failure does not stop the probe. When debugfs initialization fails, jumping to the error branch will also release regs, in addition to its own rollback operation.
As a result, it may be released repeatedly during the regs uninit process. Therefore, the null check needs to be added to the regs uninit process.
Signed-off-by: Chenghai Huang huangchenghai2@huawei.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/hisilicon/debugfs.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/drivers/crypto/hisilicon/debugfs.c b/drivers/crypto/hisilicon/debugfs.c index 13bec8b2d7237..a1d41ee39816b 100644 --- a/drivers/crypto/hisilicon/debugfs.c +++ b/drivers/crypto/hisilicon/debugfs.c @@ -744,8 +744,14 @@ static void dfx_regs_uninit(struct hisi_qm *qm, { int i;
+ if (!dregs) + return; + /* Setting the pointer is NULL to prevent double free */ for (i = 0; i < reg_len; i++) { + if (!dregs[i].regs) + continue; + kfree(dregs[i].regs); dregs[i].regs = NULL; } @@ -795,14 +801,21 @@ static struct dfx_diff_registers *dfx_regs_init(struct hisi_qm *qm, static int qm_diff_regs_init(struct hisi_qm *qm, struct dfx_diff_registers *dregs, u32 reg_len) { + int ret; + qm->debug.qm_diff_regs = dfx_regs_init(qm, qm_diff_regs, ARRAY_SIZE(qm_diff_regs)); - if (IS_ERR(qm->debug.qm_diff_regs)) - return PTR_ERR(qm->debug.qm_diff_regs); + if (IS_ERR(qm->debug.qm_diff_regs)) { + ret = PTR_ERR(qm->debug.qm_diff_regs); + qm->debug.qm_diff_regs = NULL; + return ret; + }
qm->debug.acc_diff_regs = dfx_regs_init(qm, dregs, reg_len); if (IS_ERR(qm->debug.acc_diff_regs)) { dfx_regs_uninit(qm, qm->debug.qm_diff_regs, ARRAY_SIZE(qm_diff_regs)); - return PTR_ERR(qm->debug.acc_diff_regs); + ret = PTR_ERR(qm->debug.acc_diff_regs); + qm->debug.acc_diff_regs = NULL; + return ret; }
return 0; @@ -843,7 +856,9 @@ static int qm_last_regs_init(struct hisi_qm *qm) static void qm_diff_regs_uninit(struct hisi_qm *qm, u32 reg_len) { dfx_regs_uninit(qm, qm->debug.acc_diff_regs, reg_len); + qm->debug.acc_diff_regs = NULL; dfx_regs_uninit(qm, qm->debug.qm_diff_regs, ARRAY_SIZE(qm_diff_regs)); + qm->debug.qm_diff_regs = NULL; }
/**