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libclamav: Fix issue scanning with no signatures loaded (#1560)

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If the application never calls `cl_load()`, then the clean-cache is
never initialized. That is a legitimate mode to run in when perhaps we
just want to extract stuff, record metadata, or for fuzzing.

This commit adds a check if the ctx->engine->cache is NULL. If it is,
then we treat it as though caching is disabled.

CLAM-2856
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Val S. 2025-08-28 10:31:35 -04:00 • committed by GitHub
parent 9198f411d5
commit c11ac06e0e
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1 changed files with 7 additions and 1 deletions
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8
libclamav/scanners.c
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@ -4608,7 +4608,13 @@ cl_error_t cli_magic_scan(cli_ctx *ctx, cli_file_t type)
typercg = 0;
}
if (ctx->engine->engine_options & ENGINE_OPTIONS_DISABLE_CACHE) {
/*
* Determine if caching is enabled.
* The application may have specifically disabled caching. Also, if the application never loaded any signatures,
* then the cache will be NULL and caching will also be disabled.
*/
if ((ctx->engine->engine_options & ENGINE_OPTIONS_DISABLE_CACHE) ||
(ctx->engine->cache == NULL)) {
cache_enabled = false;
}