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[24.205.208.113]) by smtp.gmail.com with ESMTPSA id w9-20020a05620a148900b005f188f755adsm2640064qkj.32.2022.02.26.07.58.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Feb 2022 07:59:00 -0800 (PST) From: trix@redhat.com To: alexander.deucher@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie, daniel@ffwll.ch, nathan@kernel.org, ndesaulniers@google.com, nirmoy.das@amd.com, lijo.lazar@amd.com, tom.stdenis@amd.com, evan.quan@amd.com, kevin1.wang@amd.com, Amaranath.Somalapuram@amd.com Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Tom Rix Subject: [PATCH] drm/amdgpu: Fix realloc of ptr Date: Sat, 26 Feb 2022 07:58:51 -0800 Message-Id: <20220226155851.4176109-1-trix@redhat.com> X-Mailer: git-send-email 2.26.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix Clang static analysis reports this error amdgpu_debugfs.c:1690:9: warning: 1st function call argument is an uninitialized value tmp = krealloc_array(tmp, i + 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~ realloc will free tmp, so tmp can not be garbage. And the return needs to be checked. Fixes: 5ce5a584cb82 ("drm/amdgpu: add debugfs for reset registers list") Signed-off-by: Tom Rix --- drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c index 9eb9b440bd438..159b97c0b4ebc 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c @@ -1676,7 +1676,7 @@ static ssize_t amdgpu_reset_dump_register_list_write(struct file *f, { struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; char reg_offset[11]; - uint32_t *tmp; + uint32_t *tmp = NULL; int ret, i = 0, len = 0; do { @@ -1688,6 +1688,10 @@ static ssize_t amdgpu_reset_dump_register_list_write(struct file *f, } tmp = krealloc_array(tmp, i + 1, sizeof(uint32_t), GFP_KERNEL); + if (!tmp) { + ret = -ENOMEM; + goto error_free; + } if (sscanf(reg_offset, "%X %n", &tmp[i], &ret) != 1) { ret = -EINVAL; goto error_free; -- 2.26.3