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number of allocated units must be an even number

This commit is contained in:
Heng Li 2017-06-26 23:15:30 -04:00
parent 0d03a43efd
commit 490a37a599
1 changed files with 1 additions and 0 deletions
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kalloc.c
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@ -154,6 +154,7 @@ void *kmalloc(void *_km, size_t n_bytes)
/* "n_units" means the number of units. The size of one unit equals to sizeof(kheader_t).
* "1" is the kheader_t of a block, which is always required. */
n_units = 1 + (n_bytes + sizeof(size_t) - 1) / sizeof(size_t);
if (n_units&1) ++n_units; /* make n_units an even number, or it will segfault if only one unit remains */
if (!(q = km->loop_head)) { /* the first time when kmalloc() is called, intialization */
km->base[1] = (size_t)(km->loop_head = q = km->base); *q = 0;