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recvfrom accesses freed netbuf.If it's reused in the small window by another thread recvfrom returns bad from info.Patch #1041 by Florian Zschocke

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This commit is contained in:
jani 2003-01-31 12:51:56 +00:00
parent ea6432702f
commit 442f46a1ce
1 changed files with 11 additions and 10 deletions
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21
src/api/sockets.c
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@ -254,6 +254,16 @@ lwip_recvfrom(int s, void *mem, int len, unsigned int flags,
the supplied memory pointer mem */
netbuf_copy_partial(buf, mem, copylen, sock->lastoffset);
/* Check to see from where the data was. */
if(from != NULL && fromlen != NULL) {
addr = netbuf_fromaddr(buf);
port = netbuf_fromport(buf);
((struct sockaddr_in *)from)->sin_addr.s_addr = addr->addr;
((struct sockaddr_in *)from)->sin_port = port;
((struct sockaddr_in *)from)->sin_family = AF_INET;
*fromlen = sizeof(struct sockaddr_in);
}
/* If this is a TCP socket, check if there is data left in the
buffer. If so, it should be saved in the sock structure for next
time around. */
@ -266,16 +276,7 @@ lwip_recvfrom(int s, void *mem, int len, unsigned int flags,
netbuf_delete(buf);
}
/* Check to see from where the data was. */
if(from != NULL && fromlen != NULL) {
addr = netbuf_fromaddr(buf);
port = netbuf_fromport(buf);
((struct sockaddr_in *)from)->sin_addr.s_addr = addr->addr;
((struct sockaddr_in *)from)->sin_port = port;
((struct sockaddr_in *)from)->sin_family = AF_INET;
*fromlen = sizeof(struct sockaddr_in);
}
return copylen;
}
/*-----------------------------------------------------------------------------------*/