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wrlib: added a limit to the image cache size (Coverity #50223)

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As pointed by Coverity, environment variables cannot be considered
trustworthy ("tainted"), so we need to make sure the values provided are
within reasonable bounds for safe operations.

Seized the opportunity to try to provide clearer name for the constants
defining the default value.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
This commit is contained in:
Christophe CURIS
2014-06-14 19:34:02 +02:00
committed by Carlos R. Mafra
parent 6623c27f4e
commit 907dd97e45
1 changed files with 15 additions and 7 deletions
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22
wrlib/load.c
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@@ -46,18 +46,21 @@ typedef struct RCachedImage {
} RCachedImage;
/*
* Size of image cache
* Number of image to keep in the cache
*/
static int RImageCacheSize = -1;
#define IMAGE_CACHE_DEFAULT_NBENTRIES 8
#define IMAGE_CACHE_MAXIMUM_NBENTRIES 256
/*
* Max. size of image to store in cache
* Max. size of image (in pixels) to store in the cache
*/
static int RImageCacheMaxImage = -1; /* 0 = any size */
#define IMAGE_CACHE_SIZE 8
#define IMAGE_CACHE_DEFAULT_MAXPIXELS (64 * 64)
#define IMAGE_CACHE_MAXIMUM_MAXPIXELS (256 * 256)
#define IMAGE_CACHE_MAX_IMAGE 64*64
static RCachedImage *RImageCache;
@@ -106,14 +109,19 @@ static void init_cache(void)
tmp = getenv("RIMAGE_CACHE");
if (!tmp || sscanf(tmp, "%i", &RImageCacheSize) != 1)
RImageCacheSize = IMAGE_CACHE_SIZE;
RImageCacheSize = IMAGE_CACHE_DEFAULT_NBENTRIES;
if (RImageCacheSize < 0)
RImageCacheSize = 0;
if (RImageCacheSize > IMAGE_CACHE_MAXIMUM_NBENTRIES)
RImageCacheSize = IMAGE_CACHE_MAXIMUM_NBENTRIES;
tmp = getenv("RIMAGE_CACHE_SIZE");
if (!tmp || sscanf(tmp, "%i", &RImageCacheMaxImage) != 1)
RImageCacheMaxImage = IMAGE_CACHE_MAX_IMAGE;
RImageCacheMaxImage = IMAGE_CACHE_DEFAULT_MAXPIXELS;
if (RImageCacheMaxImage < 0)
RImageCacheMaxImage = 0;
if (RImageCacheMaxImage > IMAGE_CACHE_MAXIMUM_MAXPIXELS)
RImageCacheMaxImage = IMAGE_CACHE_MAXIMUM_MAXPIXELS;
if (RImageCacheSize > 0) {
RImageCache = malloc(sizeof(RCachedImage) * RImageCacheSize);