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-rw-r--r--minzip/SysUtil.c46
1 files changed, 31 insertions, 15 deletions
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index 491951c9e..de47edfd9 100644
--- a/minzip/SysUtil.c
+++ b/minzip/SysUtil.c
@@ -78,7 +78,7 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
if (blksize != 0) {
blocks = ((size-1) / blksize) + 1;
}
- if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize) {
+ if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) {
LOGE("invalid data in block map file: size %zu, blksize %u, range_count %u\n",
size, blksize, range_count);
return -1;
@@ -100,9 +100,6 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
return -1;
}
- pMap->ranges[range_count-1].addr = reserve;
- pMap->ranges[range_count-1].length = blocks * blksize;
-
int fd = open(block_dev, O_RDONLY);
if (fd < 0) {
LOGE("failed to open block device %s: %s\n", block_dev, strerror(errno));
@@ -112,28 +109,46 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
}
unsigned char* next = reserve;
+ size_t remaining_size = blocks * blksize;
+ bool success = true;
for (i = 0; i < range_count; ++i) {
- int start, end;
- if (fscanf(mapf, "%d %d\n", &start, &end) != 2) {
+ size_t start, end;
+ if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) {
LOGE("failed to parse range %d in block map\n", i);
- munmap(reserve, blocks * blksize);
- free(pMap->ranges);
- return -1;
+ success = false;
+ break;
+ }
+ size_t length = (end - start) * blksize;
+ if (end <= start || ((end - start) > SIZE_MAX / blksize) || length > remaining_size) {
+ LOGE("unexpected range in block map: %zu %zu\n", start, end);
+ success = false;
+ break;
}
- void* addr = mmap64(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
+ void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)(start*blksize)));
if (addr == MAP_FAILED) {
LOGE("failed to map block %d: %s\n", i, strerror(errno));
- munmap(reserve, blocks * blksize);
- free(pMap->ranges);
- return -1;
+ success = false;
+ break;
}
pMap->ranges[i].addr = addr;
- pMap->ranges[i].length = (end-start)*blksize;
+ pMap->ranges[i].length = length;
- next += pMap->ranges[i].length;
+ next += length;
+ remaining_size -= length;
+ }
+ if (success && remaining_size != 0) {
+ LOGE("ranges in block map are invalid: remaining_size = %zu\n", remaining_size);
+ success = false;
+ }
+ if (!success) {
+ close(fd);
+ munmap(reserve, blocks * blksize);
+ free(pMap->ranges);
+ return -1;
}
+ close(fd);
pMap->addr = reserve;
pMap->length = size;
@@ -156,6 +171,7 @@ int sysMapFile(const char* fn, MemMapping* pMap)
if (sysMapBlockFile(mapf, pMap) != 0) {
LOGE("Map of '%s' failed\n", fn);
+ fclose(mapf);
return -1;
}