crypto: qat - fix compression instance leak

[ Upstream commit 795c24c ]

qat_comp_alg_init_tfm() acquires a compression instance via
qat_compression_get_instance_node() before calling qat_comp_build_ctx()
to initialize the compression context. If qat_comp_build_ctx() fails, the
function returns an error without releasing the compression instance,
causing a resource leak.

When qat_comp_build_ctx() fails, release the compression instance with
qat_compression_put_instance() and clear the context to avoid leaving a
stale reference to the released instance.

The issue was introduced when build_deflate_ctx() (which always returned
void) was replaced by qat_comp_build_ctx() (which can return an error)
without adding error handling for the failure path.

Fixes: cd0e716 ("crypto: qat - refactor compression template logic")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Laurent M Coquerel <laurent.m.coquerel@intel.com>
Reviewed-by: Ahsan Atta <ahsan.atta@intel.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: gcabiddu

drivers/crypto/intel/qat/qat_common/qat_comp_algs.c

@@ -133,7 +133,7 @@ static int qat_comp_alg_init_tfm(struct crypto_acomp *acomp_tfm)
 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp_tfm);
 	struct qat_compression_ctx *ctx = crypto_tfm_ctx(tfm);
 	struct qat_compression_instance *inst;
-	int node;
+	int node, ret;
 
 	if (tfm->node == NUMA_NO_NODE)
 		node = numa_node_id();
@@ -146,7 +146,13 @@ static int qat_comp_alg_init_tfm(struct crypto_acomp *acomp_tfm)
 		return -EINVAL;
 	ctx->inst = inst;
 
-	return qat_comp_build_ctx(inst->accel_dev, ctx->comp_ctx, QAT_DEFLATE);
+	ret = qat_comp_build_ctx(inst->accel_dev, ctx->comp_ctx, QAT_DEFLATE);
+	if (ret) {
+		qat_compression_put_instance(inst);
+		memset(ctx, 0, sizeof(*ctx));
+	}
+
+	return ret;
 }
 
 static void qat_comp_alg_exit_tfm(struct crypto_acomp *acomp_tfm)