Protect against buffer overflows and null pointer dereferences #9
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bformata() and bassignformat() have calls to vsnprintf() that can potentially overflow the buffer if the value of the second parameter is extremely large This adds some validation that bails out if the value reaches INT_MAX
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The check framework does an assertion for null pointers in the test data, but continues test execution even when the assertion fails, which leads to the potential null pointer dereference when subsequent tests does other assertions on the same pointers Now we instead abort the test with ck_abort_msg() when a null pointer is encountered
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Collaborator
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@msteinert What do you think about these changes? They should bring us to green status in both the Security and Reliability categories in SonarQube. The 10% code duplication failure can't be avoided I think given the nature of the code, but I'm open to suggestions. |
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Sorry for the delay getting to your PRs, I was on vacation last week. I'm going to try to get caught up in the next couple days. |
msteinert
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Aug 11, 2025
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msteinert
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Looks good to me.
I agree, it doesn't seem possible to avoid duplication here.
Collaborator
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Cheers! After merging this PR, one new issue and a few old ones remain, so I'll prepare a new one shortly. |
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This changeset should resolve all Security and Reliability bugs detected by SonarQube
Potential buffer overflow in bstrlib.c:
bformata() and bassignformat() have calls to vsnprintf() that can potentially overflow the buffer if the value of the second parameter (length) is extremely large
This adds some validation that bails out if the value reaches INT_MAX
Potential null pointer dereference in bstest.c:
The check framework does an assertion for null pointers in the test data, but continues test execution even when the assertion fails, which leads to the potential null pointer dereference when subsequent tests does other assertions on the same pointers
Now we instead abort the test with ck_abort_msg() when a null pointer is encountered