Module: kamailio Branch: 5.2 Commit: 71efcfbb059e72cb05572ef7d3f58ac2e7dba397 URL: https://github.com/kamailio/kamailio/commit/71efcfbb059e72cb05572ef7d3f58ac2...

Author: Daniel-Constantin Mierla miconda@gmail.com Committer: Henning Westerholt hw@skalatan.de Date: 2019-09-10T09:52:11+02:00

core: ensure index of preprocessor directive conditions is not negative

- avoid accessing the array at negative index for else processing

(cherry picked from commit 8f6e826576e52270f21c22a7d94b3026cc22c172)

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Modified: src/core/cfg.lex

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Diff: https://github.com/kamailio/kamailio/commit/71efcfbb059e72cb05572ef7d3f58ac2... Patch: https://github.com/kamailio/kamailio/commit/71efcfbb059e72cb05572ef7d3f58ac2...

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diff --git a/src/core/cfg.lex b/src/core/cfg.lex index 6a0d23d76f..6aa890f155 100644 --- a/src/core/cfg.lex +++ b/src/core/cfg.lex @@ -1922,14 +1922,24 @@ static void pp_ifdef()

static void pp_else() { + if(pp_sptr==0) { + LM_WARN("invalid position for preprocessor directive 'else'" + " - at %s line %d\n", (finame)?finame:"cfg", line); + return; + } pp_ifdef_stack[pp_sptr-1] ^= 1; pp_update_state(); }

static void pp_endif() { - pp_sptr--; pp_ifdef_level_update(-1); + if(pp_sptr==0) { + LM_WARN("invalid position for preprocessor directive 'else'" + " - at %s line %d\n", (finame)?finame:"cfg", line); + return; + } + pp_sptr--; pp_update_state(); }