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author | glebius <glebius@FreeBSD.org> | 2005-03-01 11:31:06 +0000 |
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committer | glebius <glebius@FreeBSD.org> | 2005-03-01 11:31:06 +0000 |
commit | bf0eae5562de9cfab2d424c8da0a093ed5f3e4e3 (patch) | |
tree | 332ecb5faa43623d3f8163d020d52d6bcc104e51 /sys/netgraph/ng_parse.c | |
parent | ea3bf9bbdddea0177c61e7e86335bf19e319dc7d (diff) | |
download | FreeBSD-src-bf0eae5562de9cfab2d424c8da0a093ed5f3e4e3.zip FreeBSD-src-bf0eae5562de9cfab2d424c8da0a093ed5f3e4e3.tar.gz |
Replace NG_PARSE_APPEND() macro with ng_parse_append() function. Check
its return value and free resources if function returns error. Plug
several memory leaks with this change.
Submitted by: archie
Found by: Coverity Prevent analysis tool
Diffstat (limited to 'sys/netgraph/ng_parse.c')
-rw-r--r-- | sys/netgraph/ng_parse.c | 97 |
1 files changed, 70 insertions, 27 deletions
diff --git a/sys/netgraph/ng_parse.c b/sys/netgraph/ng_parse.c index 1d06a0f..dabe1ca 100644 --- a/sys/netgraph/ng_parse.c +++ b/sys/netgraph/ng_parse.c @@ -50,6 +50,8 @@ #include <sys/mbuf.h> #include <sys/ctype.h> +#include <machine/stdarg.h> + #include <net/ethernet.h> #include <netinet/in.h> @@ -117,6 +119,8 @@ static int ng_parse_get_elem_pad(const struct ng_parse_type *type, /* Parsing helper functions */ static int ng_parse_skip_value(const char *s, int off, int *lenp); +static int ng_parse_append(char **cbufp, int *cbuflenp, + const char *fmt, ...); /* Poor man's virtual method calls */ #define METHOD(t,m) (ng_get_ ## m ## _method(t)) @@ -131,19 +135,6 @@ static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 0 : INVOKE(t, getAlign)(t)) -/* For converting binary to string */ -#define NG_PARSE_APPEND(fmt, args...) \ - do { \ - int len; \ - \ - len = snprintf((cbuf), (cbuflen), \ - fmt , ## args); \ - if (len >= (cbuflen)) \ - return (ERANGE); \ - (cbuf) += len; \ - (cbuflen) -= len; \ - } while (0) - /************************************************************************ PUBLIC FUNCTIONS ************************************************************************/ @@ -363,6 +354,7 @@ ng_int8_unparse(const struct ng_parse_type *type, { const char *fmt; int fval; + int error; int8_t val; bcopy(data + *off, &val, sizeof(int8_t)); @@ -385,7 +377,8 @@ ng_int8_unparse(const struct ng_parse_type *type, return(0); #endif } - NG_PARSE_APPEND(fmt, fval); + if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) + return (error); *off += sizeof(int8_t); return (0); } @@ -460,6 +453,7 @@ ng_int16_unparse(const struct ng_parse_type *type, { const char *fmt; int fval; + int error; int16_t val; bcopy(data + *off, &val, sizeof(int16_t)); @@ -482,7 +476,8 @@ ng_int16_unparse(const struct ng_parse_type *type, return(0); #endif } - NG_PARSE_APPEND(fmt, fval); + if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) + return (error); *off += sizeof(int16_t); return (0); } @@ -557,6 +552,7 @@ ng_int32_unparse(const struct ng_parse_type *type, { const char *fmt; long fval; + int error; int32_t val; bcopy(data + *off, &val, sizeof(int32_t)); @@ -579,7 +575,8 @@ ng_int32_unparse(const struct ng_parse_type *type, return(0); #endif } - NG_PARSE_APPEND(fmt, fval); + if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) + return (error); *off += sizeof(int32_t); return (0); } @@ -654,6 +651,7 @@ ng_int64_unparse(const struct ng_parse_type *type, const char *fmt; long long fval; int64_t val; + int error; bcopy(data + *off, &val, sizeof(int64_t)); switch ((intptr_t)type->info) { @@ -675,7 +673,8 @@ ng_int64_unparse(const struct ng_parse_type *type, return(0); #endif } - NG_PARSE_APPEND(fmt, fval); + if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) + return (error); *off += sizeof(int64_t); return (0); } @@ -748,10 +747,14 @@ ng_string_unparse(const struct ng_parse_type *type, { const char *const raw = (const char *)data + *off; char *const s = ng_encode_string(raw, strlen(raw)); + int error; if (s == NULL) return (ENOMEM); - NG_PARSE_APPEND("%s", s); + if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { + FREE(s, M_NETGRAPH_PARSE); + return (error); + } *off += strlen(raw) + 1; FREE(s, M_NETGRAPH_PARSE); return (0); @@ -913,10 +916,14 @@ ng_sizedstring_unparse(const struct ng_parse_type *type, const char *const raw = (const char *)data + *off + 2; const int slen = *((const u_int16_t *)(data + *off)); char *const s = ng_encode_string(raw, slen); + int error; if (s == NULL) return (ENOMEM); - NG_PARSE_APPEND("%s", s); + if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { + FREE(s, M_NETGRAPH_PARSE); + return (error); + } FREE(s, M_NETGRAPH_PARSE); *off += slen + 2; return (0); @@ -971,10 +978,13 @@ ng_ipaddr_unparse(const struct ng_parse_type *type, const u_char *data, int *off, char *cbuf, int cbuflen) { struct in_addr ip; + int error; bcopy(data + *off, &ip, sizeof(ip)); - NG_PARSE_APPEND("%d.%d.%d.%d", ((u_char *)&ip)[0], - ((u_char *)&ip)[1], ((u_char *)&ip)[2], ((u_char *)&ip)[3]); + if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d", + ((u_char *)&ip)[0], ((u_char *)&ip)[1], + ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0) + return (error); *off += sizeof(ip); return (0); } @@ -1382,7 +1392,9 @@ ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, return (ENOMEM); /* Opening brace/bracket */ - NG_PARSE_APPEND("%c", (ctype == CT_STRUCT) ? '{' : '['); + if ((error = ng_parse_append(&cbuf, &cbuflen, "%c", + (ctype == CT_STRUCT) ? '{' : '[')) != 0) + goto fail; /* Do each item */ for (index = 0; index < num; index++) { @@ -1411,18 +1423,23 @@ ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, } /* Print name= */ - NG_PARSE_APPEND(" "); + if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0) + goto fail; if (ctype != CT_STRUCT) { if (index != nextIndex) { nextIndex = index; - NG_PARSE_APPEND("%d=", index); + if ((error = ng_parse_append(&cbuf, + &cbuflen, "%d=", index)) != 0) + goto fail; } nextIndex++; } else { const struct ng_parse_struct_field *const fields = type->info; - NG_PARSE_APPEND("%s=", fields[index].name); + if ((error = ng_parse_append(&cbuf, + &cbuflen, "%s=", fields[index].name)) != 0) + goto fail; } /* Print value */ @@ -1438,9 +1455,15 @@ ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, FREE(workBuf, M_NETGRAPH_PARSE); /* Closing brace/bracket */ - NG_PARSE_APPEND("%s%c", - didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']'); + if ((error = ng_parse_append(&cbuf, &cbuflen, "%s%c", + didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']')) != 0) + goto fail; return (0); + +fail: + /* Clean up after failure */ + FREE(workBuf, M_NETGRAPH_PARSE); + return (error); } /* @@ -1598,6 +1621,26 @@ ng_parse_get_elem_pad(const struct ng_parse_type *type, ************************************************************************/ /* + * Append to a fixed length string buffer. + */ +static int +ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...) +{ + va_list args; + int len; + + va_start(args, fmt); + len = vsnprintf(*cbufp, *cbuflenp, fmt, args); + va_end(args); + if (len >= *cbuflenp) + return ERANGE; + *cbufp += len; + *cbuflenp -= len; + + return (0); +} + +/* * Skip over a value */ static int |