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| author | Nick Mathewson <nickm@torproject.org> | 2016-05-25 09:27:47 -0400 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2016-05-25 09:27:47 -0400 |
| commit | a3ec811c2ee801bf6dd3d7f65c4997470e807c9d (patch) | |
| tree | 9b53d8af9639cb7ba9a012e9ffc9872ae17d0c7f /src/common/memarea.c | |
| parent | 0ef36626ea0b3735d06360fde27100d33f2f5462 (diff) | |
| parent | fdfc528f85c11a1d29b6a67e32180278d1ca7cbb (diff) | |
| download | tor-a3ec811c2ee801bf6dd3d7f65c4997470e807c9d.tar.gz tor-a3ec811c2ee801bf6dd3d7f65c4997470e807c9d.zip | |
Merge branch 'maint-0.2.8'
Diffstat (limited to 'src/common/memarea.c')
| -rw-r--r-- | src/common/memarea.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/common/memarea.c b/src/common/memarea.c index 61117288c3..7d16b702e3 100644 --- a/src/common/memarea.c +++ b/src/common/memarea.c @@ -83,8 +83,7 @@ typedef struct memarea_chunk_t { struct memarea_chunk_t *next_chunk; size_t mem_size; /**< How much RAM is available in mem, total? */ char *next_mem; /**< Next position in mem to allocate data at. If it's - * greater than or equal to mem+mem_size, this chunk is - * full. */ + * equal to mem+mem_size, this chunk is full. */ #ifdef USE_ALIGNED_ATTRIBUTE /** Actual content of the memory chunk. */ char mem[FLEXIBLE_ARRAY_MEMBER] __attribute__((aligned(MEMAREA_ALIGN))); @@ -205,7 +204,10 @@ memarea_alloc(memarea_t *area, size_t sz) tor_assert(sz < SIZE_T_CEILING); if (sz == 0) sz = 1; - if (chunk->next_mem+sz > chunk->U_MEM+chunk->mem_size) { + tor_assert(chunk->next_mem <= chunk->U_MEM + chunk->mem_size); + const size_t space_remaining = + (chunk->U_MEM + chunk->mem_size) - chunk->next_mem; + if (sz > space_remaining) { if (sz+CHUNK_HEADER_SIZE >= CHUNK_SIZE) { /* This allocation is too big. Stick it in a special chunk, and put * that chunk second in the list. */ |