Potential fix for code scanning alert no. 3241: Multiplication result converted to larger type#133
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Potential fix for code scanning alert no. 3241: Multiplication result converted to larger type#133bniladridas wants to merge 1 commit into
bniladridas wants to merge 1 commit into
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… converted to larger type Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
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☑️ I checked the pre-commit hooks and there was nothing to fix at commit |
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Combines all 15 automated code scanning alert fixes for multiplication result converted to larger type. These changes span `include/stb_image.h`, `include/stb_image_write.h`, and `src/preprocess.c` with consistent application of `size_t` casts to prevent integer overflow before conversion to larger types. Overflow checks are added where allocation sizes are stored back into `int` variables such as `out_size`. > [!NOTE] > Merging this pull request will automatically close #125, #126, #127, #128, #129, #130, #131, #132, #133, #134, #135, #136, #137, #138, #139 --------- Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com> Co-authored-by: Niladri Das <bniladridas@users.noreply.github.com>
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Fixed in #140 |
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Potential fix for https://github.com/bniladridas/hybrid-compute/security/code-scanning/3241
The correct fix is to cast one multiplicand to
size_tbefore multiplication so arithmetic is performed in the larger type:memcpy(dest, cur, x * img_n);memcpy(dest, cur, (size_t)x * (size_t)img_n);This preserves behavior for valid ranges while removing intermediate overflow risk from smaller integer arithmetic.
Edit only
include/stb_image.hat the showndepth == 8/img_n == out_nbranch around line 5338. No new methods, definitions, or dependencies are required.Suggested fixes powered by Copilot Autofix. Review carefully before merging.