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spa: add spa_ptrinside

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Add a new overflow safe function to check if region p2 of size s2 fits
completely in p1 of size s1. Use this to bounds check the pod iterators.

Fixes #3727
This commit is contained in:
Wim Taymans 2023-12-20 20:18:33 +01:00
parent 92ac9a355f
commit 10d3c547d1
2 changed files with 11 additions and 9 deletions
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7
spa/include/spa/utils/defs.h
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@ -178,7 +178,6 @@ struct spa_fraction {
#define SPA_PTROFF_ALIGN(ptr_,offset_,alignment_,type_) \
SPA_PTR_ALIGN(SPA_PTROFF(ptr_,offset_,type_),alignment_,type_)
/**
* Deprecated, use SPA_PTROFF and SPA_PTROFF_ALIGN instead
*/
@ -189,6 +188,12 @@ struct spa_fraction {
#define SPA_PTRDIFF(p1,p2) ((intptr_t)(p1) - (intptr_t)(p2))
static inline bool spa_ptrinside(const void *p1, size_t s1, const void *p2, size_t s2)
{
return (uintptr_t)p1 <= (uintptr_t)p2 && s2 <= s1 &&
(uintptr_t)p2 - (uintptr_t)p1 <= s1 - s2;
}
#define SPA_PTR_TO_INT(p) ((int) ((intptr_t) (p)))
#define SPA_INT_TO_PTR(u) ((void*) ((intptr_t) (u)))