On 2/26/22 2:21 PM, David Laight wrote:
From: trix@xxxxxxxxxxSent: 26 February 2022 15:59 From: Tom Rix <trix@xxxxxxxxxx> 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
DavidFixes: 5ce5a584cb82 ("drm/amdgpu: add debugfs for reset registers list") Signed-off-by: Tom Rix <trix@xxxxxxxxxx> --- 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)
