If the malloc range passed to mem_malloc_init() is at the end of address range and 'start + size' overflows to 0, following allocations fail as mem_malloc_end is zero (which looks like uninitialized).
Fix this by subtracting 1 of 'start + size' overflows to zero.
Signed-off-by: Simon Goldschmidt simon.k.r.goldschmidt@gmail.com ---
Changes in v3: None Changes in v2: None
common/dlmalloc.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/common/dlmalloc.c b/common/dlmalloc.c index edaad299bb..51d3bd671a 100644 --- a/common/dlmalloc.c +++ b/common/dlmalloc.c @@ -603,6 +603,10 @@ void mem_malloc_init(ulong start, ulong size) mem_malloc_start = start; mem_malloc_end = start + size; mem_malloc_brk = start; + if (start && size && !mem_malloc_end) { + /* overflow: malloc area is at end of address range */ + mem_malloc_end--; + }
debug("using memory %#lx-%#lx for malloc()\n", mem_malloc_start, mem_malloc_end);