[core] Protect a string search from running out of bounds.#21320
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hageboeck merged 1 commit intoroot-project:masterfrom Feb 23, 2026
Merged
[core] Protect a string search from running out of bounds.#21320hageboeck merged 1 commit intoroot-project:masterfrom
hageboeck merged 1 commit intoroot-project:masterfrom
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When running gtest-tree-ntuple-ntuple-type-name in address sanitizer,
the check for the "const" qualifier ran out of bounds, because the
cursor in TClassEdit.cxx:1793 was already at the end of the string, and
"next" was one character after its end:
"std::vector<Double32_t[3] > [10 ] "
^
strcmp isn't designed for this case, so this commit adds length checks
before all "strcmp(base+offset, ...)" patterns.
silverweed
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Feb 19, 2026
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Test Results 22 files 22 suites 3d 6h 36m 25s ⏱️ For more details on these failures, see this check. Results for commit b09b756. ♻️ This comment has been updated with latest results. |
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When running gtest-tree-ntuple-ntuple-type-name in address sanitizer, the check for the "const" qualifier ran out of bounds, because the cursor in TClassEdit.cxx:1793 was already at the end of the string, and "next" was one character after its end:
strcmp isn't designed for this case, so this commit adds length checks
before all "strcmp(base+offset, ...)" patterns.
I believe the test worked because the garbage that's read in memory is almost always
!= 'c'('o', 'n', ...), and so the comparison is (usually) guaranteed to fail -- until it doesn't.