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authorDaniel Stenberg <daniel@haxx.se>2002-05-17 07:49:28 +0000
committerDaniel Stenberg <daniel@haxx.se>2002-05-17 07:49:28 +0000
commit9263652c6d91569ed2856b84bbd5f57c2565162a (patch)
treefc4e9453634d2486272fd3e69ef960d2d8e7b5fe /lib
parentbc7437554308bf9648dae0c2ca4508290aaa8ac5 (diff)
Fixes bug report #556930 - we need to make sure that the data is all right
after we've realloc() the packed hostent struct.
Diffstat (limited to 'lib')
-rw-r--r--lib/hostip.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/lib/hostip.c b/lib/hostip.c
index 659135455..295bed606 100644
--- a/lib/hostip.c
+++ b/lib/hostip.c
@@ -354,6 +354,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
#else /* following code is IPv4-only */
#ifndef HAVE_GETHOSTBYNAME_R
+static void hostcache_fixoffset(struct hostent *h, int offset);
/**
* Performs a "deep" copy of a hostent into a buffer (returns a pointer to the
* copy). Make absolutely sure the destination buffer is big enough!
@@ -362,11 +363,12 @@ Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
* 10/3/2001 */
static struct hostent* pack_hostent(char** buf, struct hostent* orig)
{
- char* bufptr;
+ char *bufptr;
+ char *newbuf;
struct hostent* copy;
int i;
- char* str;
+ char *str;
int len;
bufptr = *buf;
@@ -427,7 +429,18 @@ static struct hostent* pack_hostent(char** buf, struct hostent* orig)
}
copy->h_addr_list[i] = NULL;
- *buf=(char *)realloc(*buf, (int)bufptr-(int)(*buf));
+ /* now, shrink the allocated buffer to the size we actually need, which
+ most often is only a fraction of the original alloc */
+ newbuf=(char *)realloc(*buf, (int)bufptr-(int)(*buf));
+
+ /* if the alloc moved, we need to adjust things again */
+ if(newbuf != *buf)
+ hostcache_fixoffset((struct hostent*)newbuf, (int)newbuf-(int)*buf);
+
+ /* setup the return */
+ *buf = newbuf;
+ copy = (struct hostent*)newbuf;
+
return copy;
}
#endif