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authorAndrew Tridgell <tridge@samba.org>2008-02-16 07:25:38 +1100
committerAndrew Tridgell <tridge@samba.org>2008-02-16 07:25:38 +1100
commit2e4e06c6e69d881b0fc3c53df50db607fcce4a91 (patch)
treee4614d6c919021fe34ac4f0333a0131ab5abf07b /source4/libcli
parent1b09ec14a8f5e33ce4a6f41cf9d4ca8e53df4c87 (diff)
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fixed handling of zero sized buffers versus NULL buffers in
SMB2. Thanks to Metze for spotting this. (This used to be commit fbcf3e65b9284e5d1862c98706d7f148a36afe47)
Diffstat (limited to 'source4/libcli')
-rw-r--r--source4/libcli/smb2/request.c41
1 files changed, 31 insertions, 10 deletions
diff --git a/source4/libcli/smb2/request.c b/source4/libcli/smb2/request.c
index 7a0311f886..1de0531d9a 100644
--- a/source4/libcli/smb2/request.c
+++ b/source4/libcli/smb2/request.c
@@ -206,6 +206,10 @@ bool smb2_request_is_ok(struct smb2_request *req)
*/
bool smb2_oob(struct smb2_request_buffer *buf, const uint8_t *ptr, size_t size)
{
+ if (size == 0) {
+ /* zero bytes is never out of range */
+ return false;
+ }
/* be careful with wraparound! */
if (ptr < buf->body ||
ptr >= buf->body + buf->body_size ||
@@ -270,7 +274,7 @@ NTSTATUS smb2_pull_o16s16_blob(struct smb2_request_buffer *buf, TALLOC_CTX *mem_
}
ofs = SVAL(ptr, 0);
size = SVAL(ptr, 2);
- if (ofs == 0 || size == 0) {
+ if (ofs == 0) {
*blob = data_blob(NULL, 0);
return NT_STATUS_OK;
}
@@ -310,7 +314,10 @@ NTSTATUS smb2_push_o16s16_blob(struct smb2_request_buffer *buf,
return NT_STATUS_BUFFER_TOO_SMALL;
}
- if (blob.length == 0) {
+ if (blob.data == NULL) {
+ if (blob.length != 0) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
SSVAL(ptr, 0, 0);
SSVAL(ptr, 2, 0);
return NT_STATUS_OK;
@@ -363,7 +370,10 @@ NTSTATUS smb2_push_o16s32_blob(struct smb2_request_buffer *buf,
return NT_STATUS_BUFFER_TOO_SMALL;
}
- if (blob.length == 0) {
+ if (blob.data == NULL) {
+ if (blob.length != 0) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
SSVAL(ptr, 0, 0);
SIVAL(ptr, 2, 0);
return NT_STATUS_OK;
@@ -416,7 +426,10 @@ NTSTATUS smb2_push_o32s32_blob(struct smb2_request_buffer *buf,
return NT_STATUS_BUFFER_TOO_SMALL;
}
- if (blob.length == 0) {
+ if (blob.data == NULL) {
+ if (blob.length != 0) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
SIVAL(ptr, 0, 0);
SIVAL(ptr, 4, 0);
return NT_STATUS_OK;
@@ -469,7 +482,10 @@ NTSTATUS smb2_push_s32o32_blob(struct smb2_request_buffer *buf,
return NT_STATUS_BUFFER_TOO_SMALL;
}
- if (blob.length == 0) {
+ if (blob.data == NULL) {
+ if (blob.length != 0) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
SIVAL(ptr, 0, 0);
SIVAL(ptr, 4, 0);
return NT_STATUS_OK;
@@ -512,7 +528,7 @@ NTSTATUS smb2_pull_o16s32_blob(struct smb2_request_buffer *buf, TALLOC_CTX *mem_
}
ofs = SVAL(ptr, 0);
size = IVAL(ptr, 2);
- if (ofs == 0 || size == 0) {
+ if (ofs == 0) {
*blob = data_blob(NULL, 0);
return NT_STATUS_OK;
}
@@ -536,7 +552,7 @@ NTSTATUS smb2_pull_o32s32_blob(struct smb2_request_buffer *buf, TALLOC_CTX *mem_
}
ofs = IVAL(ptr, 0);
size = IVAL(ptr, 4);
- if (ofs == 0 || size == 0) {
+ if (ofs == 0) {
*blob = data_blob(NULL, 0);
return NT_STATUS_OK;
}
@@ -563,7 +579,7 @@ NTSTATUS smb2_pull_o16As32_blob(struct smb2_request_buffer *buf, TALLOC_CTX *mem
}
ofs = SVAL(ptr, 0);
size = IVAL(ptr, 4);
- if (ofs == 0 || size == 0) {
+ if (ofs == 0) {
*blob = data_blob(NULL, 0);
return NT_STATUS_OK;
}
@@ -587,7 +603,7 @@ NTSTATUS smb2_pull_s32o32_blob(struct smb2_request_buffer *buf, TALLOC_CTX *mem_
}
size = IVAL(ptr, 0);
ofs = IVAL(ptr, 4);
- if (ofs == 0 || size == 0) {
+ if (ofs == 0) {
*blob = data_blob(NULL, 0);
return NT_STATUS_OK;
}
@@ -614,6 +630,11 @@ NTSTATUS smb2_pull_o16s16_string(struct smb2_request_buffer *buf, TALLOC_CTX *me
status = smb2_pull_o16s16_blob(buf, mem_ctx, ptr, &blob);
NT_STATUS_NOT_OK_RETURN(status);
+ if (blob.data == NULL) {
+ *str = NULL;
+ return NT_STATUS_OK;
+ }
+
if (blob.length == 0) {
char *s;
s = talloc_strdup(mem_ctx, "");
@@ -643,7 +664,7 @@ NTSTATUS smb2_push_o16s16_string(struct smb2_request_buffer *buf,
NTSTATUS status;
ssize_t size;
- if (strcmp("", str) == 0) {
+ if (str == NULL) {
return smb2_push_o16s16_blob(buf, ofs, data_blob(NULL, 0));
}