| Message ID | 20241014093605.3.I66049c2c17bd82767661f0ecd741b20453da02b2@changeid (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] drm/msm: Avoid NULL dereference in msm_disp_state_print_regs() | expand |
On 10/14/2024 9:36 AM, Douglas Anderson wrote: > The msm_disp_state_dump_regs(): > > - Doesn't allocate if the caller already allocated. ...but there's one > caller and it doesn't allocate so we don't need this check. > - Checks for allocation failure over and over even though it could > just do it once right after the allocation. > > Clean this up. > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > --- > > .../gpu/drm/msm/disp/msm_disp_snapshot_util.c | 19 ++++++++----------- > 1 file changed, 8 insertions(+), 11 deletions(-) > Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
diff --git a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c index 4d55e3cf570f..07a2c1e87219 100644 --- a/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c +++ b/drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c @@ -25,24 +25,21 @@ static void msm_disp_state_dump_regs(u32 **reg, u32 aligned_len, void __iomem *b addr = base_addr; end_addr = base_addr + aligned_len; - if (!(*reg)) - *reg = kvzalloc(len_padded, GFP_KERNEL); - - if (*reg) - dump_addr = *reg; + *reg = kvzalloc(len_padded, GFP_KERNEL); + if (!*reg) + return; + dump_addr = *reg; for (i = 0; i < num_rows; i++) { x0 = (addr < end_addr) ? readl_relaxed(addr + 0x0) : 0; x4 = (addr + 0x4 < end_addr) ? readl_relaxed(addr + 0x4) : 0; x8 = (addr + 0x8 < end_addr) ? readl_relaxed(addr + 0x8) : 0; xc = (addr + 0xc < end_addr) ? readl_relaxed(addr + 0xc) : 0; - if (dump_addr) { - dump_addr[i * 4] = x0; - dump_addr[i * 4 + 1] = x4; - dump_addr[i * 4 + 2] = x8; - dump_addr[i * 4 + 3] = xc; - } + dump_addr[i * 4] = x0; + dump_addr[i * 4 + 1] = x4; + dump_addr[i * 4 + 2] = x8; + dump_addr[i * 4 + 3] = xc; addr += REG_DUMP_ALIGN; }
The msm_disp_state_dump_regs(): - Doesn't allocate if the caller already allocated. ...but there's one caller and it doesn't allocate so we don't need this check. - Checks for allocation failure over and over even though it could just do it once right after the allocation. Clean this up. Signed-off-by: Douglas Anderson <dianders@chromium.org> --- .../gpu/drm/msm/disp/msm_disp_snapshot_util.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-)