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Merge pull request #6609 from gilles-peskine-arm/mpi_sint-min-ub

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Fix undefined behavior in bignum: NULL+0 and -most-negative-sint
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Gilles Peskine
2022-11-21 19:51:58 +01:00
committed by GitHub
parent 8b85b4835e ef7f4e47b1
commit 339406daf9
6 changed files with 190 additions and 5 deletions
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4
ChangeLog.d/mpi-add-0-ub.txt Normal file
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@@ -0,0 +1,4 @@
Bugfix
* Fix undefined behavior (typically harmless in practice) of
mbedtls_mpi_add_mpi(), mbedtls_mpi_add_abs() and mbedtls_mpi_add_int()
when both operands are 0 and the left operand is represented with 0 limbs.

4
ChangeLog.d/mpi-most-negative-sint.txt Normal file
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@@ -0,0 +1,4 @@
Bugfix
* Fix undefined behavior (typically harmless in practice) when some bignum
functions receive the most negative value of mbedtls_mpi_sint. Credit
to OSS-Fuzz. Fixes #6597.