desc.c: use xsnprintf instead of sprintf

* desc.c: Include "xstring.h".
(decode_select): Replace sprintf with xsnprintf.

diff --git a/desc.c b/desc.c
index 52e58c86e95610952d3bdc554078e30e8b9ebadf..e0b2dcd948b29c4a0908e63e586403cb0df3307d 100644 (file)
--- a/desc.c
+++ b/desc.c
@@ -30,6 +30,7 @@
  */
 
 #include "defs.h"
+#include "xstring.h"
 
 SYS_FUNC(close)
 {
@@ -157,7 +158,9 @@ decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
                                /* +2 chars needed at the end: ']',NUL */
                                if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
                                        if (first) {
-                                               outptr += sprintf(outptr, "%s%s [%u",
+                                               outptr += xsnprintf(outptr,
+                                                       sizeof(outstr) - (outptr - outstr),
+                                                       "%s%s [%u",
                                                        sep,
                                                        i == 0 ? "in" : i == 1 ? "out" : "except",
                                                        j
@@ -165,7 +168,9 @@ decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
                                                first = 0;
                                                sep = ", ";
                                        } else {
-                                               outptr += sprintf(outptr, " %u", j);
+                                               outptr += xsnprintf(outptr,
+                                                       sizeof(outstr) - (outptr - outstr),
+                                                       " %u", j);
                                        }
                                }
                                if (--ready_fds == 0)
@@ -179,7 +184,9 @@ decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
                if (args[4]) {
                        const char *str = sprint_tv_ts(tcp, args[4]);
                        if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
-                               outptr += sprintf(outptr, "%sleft %s", sep, str);
+                               outptr += xsnprintf(outptr,
+                                       sizeof(outstr) - (outptr - outstr),
+                                       "%sleft %s", sep, str);
                        }
                }
                *outptr = '\0';