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[libesl] Make sure esl event buffer array subscript ist within bounds [0, sizeof(buffer)-1]. 

cc1: warnings being treated as errors
  libs/esl/src/esl.c: In function "esl_recv_event":
  libs/esl/src/esl.c:1190: error: array subscript is above array bounds
  libs/esl/src/esl.c:1227: error: array subscript is above array bounds

Clamp handle_recv() return value to safe values.

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
This commit is contained in:
Stefan Knoblich 2011-12-19 20:39:51 +01:00
parent cd7047a30c
commit cc083ccddb
1 changed files with 12 additions and 2 deletions
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14
libs/esl/src/esl.c
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@ -72,6 +72,16 @@
#include <poll.h>
#endif
#ifndef ESL_MIN
#define ESL_MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
#ifndef ESL_MAX
#define ESL_MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
#ifndef ESL_CLAMP
#define ESL_CLAMP(min,max,val) (ESL_MIN(max,ESL_MAX(val,min)))
#endif
/* Written by Marc Espie, public domain */
#define ESL_CTYPE_NUM_CHARS 256
@ -1187,7 +1197,7 @@ ESL_DECLARE(esl_status_t) esl_recv_event(esl_handle_t *handle, int check_q, esl_
}
rrval = handle_recv(handle, handle->socket_buf, sizeof(handle->socket_buf) - 1);
*((char *)handle->socket_buf + rrval) = '\0';
*((char *)handle->socket_buf + ESL_CLAMP(0, sizeof(handle->socket_buf) - 1, rrval)) = '\0';
if (rrval == 0) {
if (++zc >= 100) {
@ -1224,7 +1234,7 @@ ESL_DECLARE(esl_status_t) esl_recv_event(esl_handle_t *handle, int check_q, esl_
sofar = esl_buffer_read(handle->packet_buf, body, len);
} else {
r = handle_recv(handle, handle->socket_buf, sizeof(handle->socket_buf) - 1);
*((char *)handle->socket_buf + r) = '\0';
*((char *)handle->socket_buf + ESL_CLAMP(0, sizeof(handle->socket_buf) - 1, r)) = '\0';
if (r < 0) {
strerror_r(handle->errnum, handle->err, sizeof(handle->err));