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Message-ID: <a857b5ec-8a6c-9c84-0525-33155261dd41@redhat.com> Date: Sun, 27 Feb 2022 06:36:32 -0800 From: Tom Rix <trix@...hat.com> To: David Laight <David.Laight@...LAB.COM>, "alexander.deucher@....com" <alexander.deucher@....com>, "christian.koenig@....com" <christian.koenig@....com>, "Xinhui.Pan@....com" <Xinhui.Pan@....com>, "airlied@...ux.ie" <airlied@...ux.ie>, "daniel@...ll.ch" <daniel@...ll.ch>, "nathan@...nel.org" <nathan@...nel.org>, "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>, "nirmoy.das@....com" <nirmoy.das@....com>, "lijo.lazar@....com" <lijo.lazar@....com>, "tom.stdenis@....com" <tom.stdenis@....com>, "evan.quan@....com" <evan.quan@....com>, "kevin1.wang@....com" <kevin1.wang@....com>, "Amaranath.Somalapuram@....com" <Amaranath.Somalapuram@....com> Cc: "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>, "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "llvm@...ts.linux.dev" <llvm@...ts.linux.dev> Subject: Re: [PATCH] drm/amdgpu: Fix realloc of ptr On 2/26/22 2:21 PM, David Laight wrote: > From: trix@...hat.com >> Sent: 26 February 2022 15:59 >> >> From: Tom Rix <trix@...hat.com> >> >> 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. > Are you sure? > A quick check seems to show that krealloc() behaves the same > way as libc realloc() and the pointer isn't freed on failure. I suck, I'll respin the patch Thanks Tom > > David > >> Fixes: 5ce5a584cb82 ("drm/amdgpu: add debugfs for reset registers list") >> Signed-off-by: Tom Rix <trix@...hat.com> >> --- >> 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 > - > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK > Registration No: 1397386 (Wales) >
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