[PATCH] v9fs-fix-check-conv-buf.patch
From: Latchesar Ionkov
Date: Tue Sep 20 2005 - 20:18:05 EST
Signed-off-by: Latchesar Ionkov <lucho@xxxxxxxxxx>
Check if the conv buffer has enough space for the operation performed.
The checking was lost when buf_check_overflow was converted from macro to
inline function.
---
commit 4e674e810f621d61c8cdf35ed3306e0a6c62acb6
tree ce9872242ab95a59050e2125e42617de4a98e741
parent c90eef84b8f5c7416cb99ab6907896f2dd392b4d
author Latchesar Ionkov <lucho@xxxxxxxxxx> Tue, 20 Sep 2005 19:25:18 -0400
committer Latchesar Ionkov <lucho@xxxxxxxxxx> Tue, 20 Sep 2005 19:25:18 -0400
fs/9p/conv.c | 153 ++++++++++++++++++++++++++++++++--------------------------
1 files changed, 84 insertions(+), 69 deletions(-)
diff --git a/fs/9p/conv.c b/fs/9p/conv.c
--- a/fs/9p/conv.c
+++ b/fs/9p/conv.c
@@ -3,6 +3,7 @@
*
* 9P protocol conversion functions
*
+ * Copyright (C) 2004, 2005 by Latchesar Ionkov <lucho@xxxxxxxxxx>
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@xxxxxxxxx>
* Copyright (C) 2002 by Ron Minnich <rminnich@xxxxxxxx>
*
@@ -55,66 +56,70 @@ static inline int buf_check_overflow(str
return buf->p > buf->ep;
}
-static inline void buf_check_size(struct cbuf *buf, int len)
+static inline int buf_check_size(struct cbuf *buf, int len)
{
if (buf->p+len > buf->ep) {
if (buf->p < buf->ep) {
eprintk(KERN_ERR, "buffer overflow\n");
buf->p = buf->ep + 1;
+ return 0;
}
}
+
+ return 1;
}
static inline void *buf_alloc(struct cbuf *buf, int len)
{
void *ret = NULL;
- buf_check_size(buf, len);
- ret = buf->p;
- buf->p += len;
+ if (buf_check_size(buf, len)) {
+ ret = buf->p;
+ buf->p += len;
+ }
return ret;
}
static inline void buf_put_int8(struct cbuf *buf, u8 val)
{
- buf_check_size(buf, 1);
-
- buf->p[0] = val;
- buf->p++;
+ if (buf_check_size(buf, 1)) {
+ buf->p[0] = val;
+ buf->p++;
+ }
}
static inline void buf_put_int16(struct cbuf *buf, u16 val)
{
- buf_check_size(buf, 2);
-
- *(__le16 *) buf->p = cpu_to_le16(val);
- buf->p += 2;
+ if (buf_check_size(buf, 2)) {
+ *(__le16 *) buf->p = cpu_to_le16(val);
+ buf->p += 2;
+ }
}
static inline void buf_put_int32(struct cbuf *buf, u32 val)
{
- buf_check_size(buf, 4);
-
- *(__le32 *)buf->p = cpu_to_le32(val);
- buf->p += 4;
+ if (buf_check_size(buf, 4)) {
+ *(__le32 *)buf->p = cpu_to_le32(val);
+ buf->p += 4;
+ }
}
static inline void buf_put_int64(struct cbuf *buf, u64 val)
{
- buf_check_size(buf, 8);
-
- *(__le64 *)buf->p = cpu_to_le64(val);
- buf->p += 8;
+ if (buf_check_size(buf, 8)) {
+ *(__le64 *)buf->p = cpu_to_le64(val);
+ buf->p += 8;
+ }
}
static inline void buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
{
- buf_check_size(buf, slen + 2);
-
- buf_put_int16(buf, slen);
- memcpy(buf->p, s, slen);
- buf->p += slen;
+ if (buf_check_size(buf, slen + 2)) {
+ buf_put_int16(buf, slen);
+ memcpy(buf->p, s, slen);
+ buf->p += slen;
+ }
}
static inline void buf_put_string(struct cbuf *buf, const char *s)
@@ -124,20 +129,20 @@ static inline void buf_put_string(struct
static inline void buf_put_data(struct cbuf *buf, void *data, u32 datalen)
{
- buf_check_size(buf, datalen);
-
- memcpy(buf->p, data, datalen);
- buf->p += datalen;
+ if (buf_check_size(buf, datalen)) {
+ memcpy(buf->p, data, datalen);
+ buf->p += datalen;
+ }
}
static inline u8 buf_get_int8(struct cbuf *buf)
{
u8 ret = 0;
- buf_check_size(buf, 1);
- ret = buf->p[0];
-
- buf->p++;
+ if (buf_check_size(buf, 1)) {
+ ret = buf->p[0];
+ buf->p++;
+ }
return ret;
}
@@ -146,10 +151,10 @@ static inline u16 buf_get_int16(struct c
{
u16 ret = 0;
- buf_check_size(buf, 2);
- ret = le16_to_cpu(*(__le16 *)buf->p);
-
- buf->p += 2;
+ if (buf_check_size(buf, 2)) {
+ ret = le16_to_cpu(*(__le16 *)buf->p);
+ buf->p += 2;
+ }
return ret;
}
@@ -158,10 +163,10 @@ static inline u32 buf_get_int32(struct c
{
u32 ret = 0;
- buf_check_size(buf, 4);
- ret = le32_to_cpu(*(__le32 *)buf->p);
-
- buf->p += 4;
+ if (buf_check_size(buf, 4)) {
+ ret = le32_to_cpu(*(__le32 *)buf->p);
+ buf->p += 4;
+ }
return ret;
}
@@ -170,10 +175,10 @@ static inline u64 buf_get_int64(struct c
{
u64 ret = 0;
- buf_check_size(buf, 8);
- ret = le64_to_cpu(*(__le64 *)buf->p);
-
- buf->p += 8;
+ if (buf_check_size(buf, 8)) {
+ ret = le64_to_cpu(*(__le64 *)buf->p);
+ buf->p += 8;
+ }
return ret;
}
@@ -181,27 +186,35 @@ static inline u64 buf_get_int64(struct c
static inline int
buf_get_string(struct cbuf *buf, char *data, unsigned int datalen)
{
+ u16 len = 0;
- u16 len = buf_get_int16(buf);
- buf_check_size(buf, len);
- if (len + 1 > datalen)
- return 0;
-
- memcpy(data, buf->p, len);
- data[len] = 0;
- buf->p += len;
+ len = buf_get_int16(buf);
+ if (!buf_check_overflow(buf) && buf_check_size(buf, len) && len+1>datalen) {
+ memcpy(data, buf->p, len);
+ data[len] = 0;
+ buf->p += len;
+ len++;
+ }
- return len + 1;
+ return len;
}
static inline char *buf_get_stringb(struct cbuf *buf, struct cbuf *sbuf)
{
- char *ret = NULL;
- int n = buf_get_string(buf, sbuf->p, sbuf->ep - sbuf->p);
+ char *ret;
+ u16 len;
+
+ ret = NULL;
+ len = buf_get_int16(buf);
- if (n > 0) {
+ if (!buf_check_overflow(buf) && buf_check_size(buf, len) &&
+ buf_check_size(sbuf, len+1)) {
+
+ memcpy(sbuf->p, buf->p, len);
+ sbuf->p[len] = 0;
ret = sbuf->p;
- sbuf->p += n;
+ buf->p += len;
+ sbuf->p += len + 1;
}
return ret;
@@ -209,12 +222,15 @@ static inline char *buf_get_stringb(stru
static inline int buf_get_data(struct cbuf *buf, void *data, int datalen)
{
- buf_check_size(buf, datalen);
+ int ret = 0;
- memcpy(data, buf->p, datalen);
- buf->p += datalen;
+ if (buf_check_size(buf, datalen)) {
+ memcpy(data, buf->p, datalen);
+ buf->p += datalen;
+ ret = datalen;
+ }
- return datalen;
+ return ret;
}
static inline void *buf_get_datab(struct cbuf *buf, struct cbuf *dbuf,
@@ -223,13 +239,12 @@ static inline void *buf_get_datab(struct
char *ret = NULL;
int n = 0;
- buf_check_size(dbuf, datalen);
-
- n = buf_get_data(buf, dbuf->p, datalen);
-
- if (n > 0) {
- ret = dbuf->p;
- dbuf->p += n;
+ if (buf_check_size(dbuf, datalen)) {
+ n = buf_get_data(buf, dbuf->p, datalen);
+ if (n > 0) {
+ ret = dbuf->p;
+ dbuf->p += n;
+ }
}
return ret;
-
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