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Import a vendor fix for a list overrun.

Browse Source 
This has been considered as a security hole on some specialized ml,
but currently the secteam@ doesn't consider that way.

Reviewed by:	emaste, des
Sponsored by:	Sandvine Incorporated
MFC after:	3 days
This commit is contained in:
Attilio Rao 2009-09-07 09:30:37 +00:00
parent b61d9eabb4
commit dcc3a33188
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=196916
2 changed files with 13 additions and 7 deletions
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2
contrib/gdtoa/gdtoaimp.h
View File

@ -485,7 +485,7 @@ extern pthread_mutex_t __gdtoa_locks[2];
_pthread_mutex_unlock(&__gdtoa_locks[n]); \
} while(0)
#define Kmax 15
#define Kmax 9
struct
Bigint {

18
contrib/gdtoa/misc.c
View File

@ -55,7 +55,9 @@ Balloc
#endif
ACQUIRE_DTOA_LOCK(0);
if ( (rv = freelist[k]) !=0) {
/* The k > Kmax case does not need ACQUIRE_DTOA_LOCK(0), */
/* but this case seems very unlikely. */
if (k <= Kmax && (rv = freelist[k]) !=0) {
freelist[k] = rv->next;
}
else {
@ -65,7 +67,7 @@ Balloc
#else
len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1)
/sizeof(double);
if (pmem_next - private_mem + len <= PRIVATE_mem) {
if (k <= Kmax && pmem_next - private_mem + len <= PRIVATE_mem) {
rv = (Bigint*)pmem_next;
pmem_next += len;
}
@ -89,10 +91,14 @@ Bfree
#endif
{
if (v) {
ACQUIRE_DTOA_LOCK(0);
v->next = freelist[v->k];
freelist[v->k] = v;
FREE_DTOA_LOCK(0);
if (v->k > Kmax)
free((void*)v);
else {
ACQUIRE_DTOA_LOCK(0);
v->next = freelist[v->k];
freelist[v->k] = v;
FREE_DTOA_LOCK(0);
}
}
}