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Prevent overflow of disc cache hysteresis.

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The default disc cache size is 1GB (1024 * 1024 * 1024).
On systems with 32bit size_t, the hysteresis calculation,
which multiplied 1GB by 20 would overflow, causing a zero
hysteresis.

    (1024 * 1024 * 1024) * 20 % (2^32)
    = 0

Thanks to Jonas Amoson for reporting.
This commit is contained in:
Michael Drake 2021-01-25 13:39:28 +00:00
parent 98496cdae1
commit da2aa05b73
1 changed files with 3 additions and 3 deletions
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6
desktop/netsurf.c
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@ -155,10 +155,10 @@ nserror netsurf_init(const char *store_path)
hlcache_parameters.llcache.fetch_attempts = nsoption_uint(max_retried_fetches); hlcache_parameters.llcache.fetch_attempts = nsoption_uint(max_retried_fetches);
/* image cache is 25% of total memory cache size */ /* image cache is 25% of total memory cache size */
image_cache_parameters.limit = (hlcache_parameters.llcache.limit * 25) / 100; image_cache_parameters.limit = hlcache_parameters.llcache.limit / 4;
/* image cache hysteresis is 20% of the image cache size */ /* image cache hysteresis is 20% of the image cache size */
image_cache_parameters.hysteresis = (image_cache_parameters.limit * 20) / 100; image_cache_parameters.hysteresis = image_cache_parameters.limit / 5;
/* account for image cache use from total */ /* account for image cache use from total */
hlcache_parameters.llcache.limit -= image_cache_parameters.limit; hlcache_parameters.llcache.limit -= image_cache_parameters.limit;
@ -167,7 +167,7 @@ nserror netsurf_init(const char *store_path)
hlcache_parameters.llcache.store.limit = nsoption_uint(disc_cache_size); hlcache_parameters.llcache.store.limit = nsoption_uint(disc_cache_size);
/* set backing store hysterissi to 20% */ /* set backing store hysterissi to 20% */
hlcache_parameters.llcache.store.hysteresis = (hlcache_parameters.llcache.store.limit * 20) / 100;; hlcache_parameters.llcache.store.hysteresis = hlcache_parameters.llcache.store.limit / 5;
/* set the path to the backing store */ /* set the path to the backing store */
hlcache_parameters.llcache.store.path = hlcache_parameters.llcache.store.path =