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thunderbolt: Reject zero-length property entries in validator

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Reject zero-length property entries in validator tb_property_entry_valid() accepts entries with length == 0 for DIRECTORY, DATA, and TEXT types. A zero-length TEXT entry passes validation but causes an underflow in the null-termination logic: property->value.text[property->length * 4 - 1] = '\0'; When property->length is 0 this writes to offset -1 relative to the allocation. Reject zero-length entries early in the validator since they have no valid representation in the XDomain property protocol.

Affected products

Linux
  • =<5.10.*
  • <99d9dbad1463afb510d42c9714f846361d1b726d
  • <5f56bc6bddffe8710ba0ba8844023b5a44ca90e4
  • =<6.1.*
  • =<6.18.*
  • <ca11e7da4fba4b394f69e16448f4463c44c84de6
  • <2e0ddac549ebd713eb9f4a15b6496e3440a17d8b
  • =<6.6.*
  • <cff8eb65d1eafe7793e54b4d0cf6bf831644630b
  • =<5.15.*
  • =<6.12.*
  • ==4.15
  • =<7.0.*
  • <581c2053ab4dbe27e83c9e62deb4c73aa8dc0c3a
  • <3b6e68cb97f725385010264a873e14a3921b6b8a
  • <4.15
  • <35d6c9252a152e756768a26dbf216b9dd9dd8e92
  • =<*