| Message ID | 20241211122026.797511-1-karprzy7@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm: zynqmp_dp: Fix integer overflow in zynqmp_dp_rate_get() | expand |
Hi Karol, Thank you for the patch. On Wed, Dec 11, 2024 at 01:20:26PM +0100, Karol Przybylski wrote: > This patch fixes a potential integer overflow in the zynqmp_dp_rate_get() function. > > The issue comes up when the expression drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000 is evaluated using 32-bit arithmetic. Please wrap your commit message text to 82 columns. > > Now the constant is casted to compatible u64 type. > > Resolves CID 1636340 and CID 1635811 > Does this need a Fixes: tag ? How about 'Cc: stable@vger.kernel.org' to get it backported to stable kernels ? > Signed-off-by: Karol Przybylski <karprzy7@gmail.com> > --- > drivers/gpu/drm/xlnx/zynqmp_dp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c > index 25c5dc61e..55e92344b 100644 > --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c > +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c > @@ -2190,7 +2190,7 @@ static int zynqmp_dp_rate_get(void *data, u64 *val) > struct zynqmp_dp *dp = data; > > mutex_lock(&dp->lock); > - *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000; > + *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * (u64)10000; You can also make the integer a 64-bit constant with *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000ULL; > mutex_unlock(&dp->lock); > return 0; > }
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index 25c5dc61e..55e92344b 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -2190,7 +2190,7 @@ static int zynqmp_dp_rate_get(void *data, u64 *val) struct zynqmp_dp *dp = data; mutex_lock(&dp->lock); - *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000; + *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * (u64)10000; mutex_unlock(&dp->lock); return 0; }
This patch fixes a potential integer overflow in the zynqmp_dp_rate_get() function. The issue comes up when the expression drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000 is evaluated using 32-bit arithmetic. Now the constant is casted to compatible u64 type. Resolves CID 1636340 and CID 1635811 Signed-off-by: Karol Przybylski <karprzy7@gmail.com> --- drivers/gpu/drm/xlnx/zynqmp_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)