check for overflow in calculate_nbytes#11217

JacobSzwejbka · 2025-05-29T16:54:40Z

Summary: Got a fuzzer error around overflow here

Differential Revision: D75544079

pytorch-bot · 2025-05-29T16:54:44Z

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facebook-github-bot · 2025-05-29T16:54:51Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Differential Revision: D75544079

facebook-github-bot · 2025-05-29T17:35:12Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Pull Request resolved: pytorch#11217 Got a fuzzer error around overflow here Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Differential Revision: D75544079

facebook-github-bot · 2025-05-29T20:00:08Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Pull Request resolved: pytorch#11217 Got a fuzzer error around overflow here Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Differential Revision: D75544079

lucylq

Thanks for adding this! Could you also make the same changes to tensor_layout?

executorch/runtime/core/tensor_layout.cpp

Line 19 in 14c3b31

Result<size_t> calculate_nbytes(

runtime/executor/method_meta.cpp

facebook-github-bot · 2025-05-30T17:13:50Z

@JacobSzwejbka has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

Summary: Got a fuzzer error around overflow here Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-05-30T17:17:21Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-05-30T17:18:10Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-02T23:44:40Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Pull Request resolved: pytorch#11217 Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T04:26:20Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T16:52:51Z

This pull request was exported from Phabricator. Differential Revision: D75544079

facebook-github-bot · 2025-06-03T16:57:12Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Pull Request resolved: pytorch#11217 Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

swolchok · 2025-06-03T17:15:50Z

runtime/executor/method_meta.cpp

+// Check for overflow
+ET_CHECK(sizes[i] == 0 || n / sizes[i] == prev_n);


is it necessary to perform a division here? could we check n >= prev_n instead?

Ah ok no it doesnt work. I can give a counter example.
To get the numbers smaller lets say Im accumulating in uint16_t and Im taking the product of int8_t::max
n: 127 prev_n: 1
n: 16129 prev_n: 127
n: 16767 prev_n: 16129 (overflowed at 65535 from logical value 2048383)

hmm. I'm tempted to ask if we should just import c10/util/safe_numerics.h (which, note to self, requires llvmMathExtra.h) instead of doing division then. it is annoying that it only has 64-bit safe_multiplies functions, but we could add a size_t-based one (in executorch for now if you don't want to wait for pin bump, followed by adding it in pytorch, getting a pin bump, and deleting the executorch one).

runtime/executor/method_meta.cpp

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T17:45:25Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T17:58:13Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T18:21:19Z

This pull request was exported from Phabricator. Differential Revision: D75544079

Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

facebook-github-bot · 2025-06-03T18:51:46Z

This pull request was exported from Phabricator. Differential Revision: D75544079

JacobSzwejbka requested review from lucylq and swolchok as code owners May 29, 2025 16:54

facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. fb-exported labels May 29, 2025

JacobSzwejbka added a commit to JacobSzwejbka/executorch-1 that referenced this pull request May 29, 2025
check for overflow in calculate_nbytes (pytorch#11217)
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Summary: Got a fuzzer error around overflow here Differential Revision: D75544079

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check for overflow in calculate_nbytes (pytorch#11217)
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Summary: Pull Request resolved: pytorch#11217 Got a fuzzer error around overflow here Differential Revision: D75544079

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check for overflow in calculate_nbytes (pytorch#11217)
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check for overflow in calculate_nbytes (pytorch#11217)
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Summary: Pull Request resolved: pytorch#11217 Got a fuzzer error around overflow here Differential Revision: D75544079

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check for overflow in calculate_nbytes (pytorch#11217)
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Summary: Got a fuzzer error around overflow here Differential Revision: D75544079

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check for overflow in calculate_nbytes (pytorch#11217)
aca6a6d
Summary: Got a fuzzer error around overflow here Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

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check for overflow in calculate_nbytes (pytorch#11217)
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check for overflow in calculate_nbytes (pytorch#11217)
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check for overflow in calculate_nbytes (pytorch#11217)
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check for overflow in calculate_nbytes (pytorch#11217)
b4b35e2
Summary: Got a fuzzer error around overflow here Test Plan: Imported from GitHub, without a `Test Plan:` line. Rollback Plan: Reviewed By: lucylq Differential Revision: D75544079 Pulled By: JacobSzwejbka

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lucylq merged commit 93b1a0c into pytorch:mainJun 4, 2025
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JacobSzwejbka mentioned this pull request Jun 4, 2025
Import and extend c10/util/safe_numerics.h #11370
Closed

		// Check for overflow
		ET_CHECK(sizes[i] == 0 \|\| n / sizes[i] == prev_n);

check for overflow in calculate_nbytes#11217

check for overflow in calculate_nbytes #11217

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