[v5,1/7] libcamera: software_isp: Fix width adjustment in SwStatsCpu::setWindow
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Message ID 20250929201924.45019-2-mzamazal@redhat.com
State New
Headers show
Series
  • Fix stats related problems in software ISP
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Commit Message

Milan Zamazal Sept. 29, 2025, 8:19 p.m. UTC 
SwStatsCpu::setWindow reduces the window width by the added x-offset, to
prevent exceeding image bounds.  But if the window width is smaller than
the x-offset, we get unsigned integer underflow.  Fix it by setting the
window width to 0 in such a case.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Hans de Goede <hansg@kernel.org>
---
 src/libcamera/software_isp/swstats_cpu.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/src/libcamera/software_isp/swstats_cpu.cpp b/src/libcamera/software_isp/swstats_cpu.cpp
index 4b77b3600..e8a1d52f2 100644
--- a/src/libcamera/software_isp/swstats_cpu.cpp
+++ b/src/libcamera/software_isp/swstats_cpu.cpp
@@ -426,7 +426,7 @@  void SwStatsCpu::setWindow(const Rectangle &window)
 	window_.y &= ~(patternSize_.height - 1);
 
 	/* width_ - xShift_ to make sure the window fits */
-	window_.width -= xShift_;
+	window_.width = (window_.width > xShift_ ? window_.width - xShift_ : 0);
 	window_.width &= ~(patternSize_.width - 1);
 	window_.height &= ~(patternSize_.height - 1);
 }