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authorUlrich Drepper <drepper@redhat.com>2004-07-23 06:09:22 +0000
committerUlrich Drepper <drepper@redhat.com>2004-07-23 06:09:22 +0000
commit54c36b13af381020233eaaff74e154aa105e13f1 (patch)
tree45b485a237abd7f1fd41d4dcabe6848a5b305e6d /nscd
parentf87475f7faba2a23c8fd1af1b2424c6f4680f55c (diff)
downloadglibc-54c36b13af381020233eaaff74e154aa105e13f1.tar.gz
Update.
2004-07-22 Ulrich Drepper <drepper@redhat.com> * nscd/nscd_getgr_r.c (nscd_getgr_r): Avoid read call with NULL pointer and zero length.
Diffstat (limited to 'nscd')
-rw-r--r--nscd/nscd_getgr_r.c30
1 files changed, 17 insertions, 13 deletions
diff --git a/nscd/nscd_getgr_r.c b/nscd/nscd_getgr_r.c
index b9cde73044..d932624d19 100644
--- a/nscd/nscd_getgr_r.c
+++ b/nscd/nscd_getgr_r.c
@@ -67,7 +67,7 @@ __nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
static int
internal_function
nscd_getgr_r (const char *key, size_t keylen, request_type type,
- struct group *resultbuf, char *buffer, size_t buflen,
+ struct group *resbuf, char *buffer, size_t buflen,
struct group **result)
{
gr_response_header gr_resp;
@@ -115,17 +115,17 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type,
buflen -= total_len;
p += align;
- resultbuf->gr_mem = (char **) p;
+ resbuf->gr_mem = (char **) p;
p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
/* Set pointers for strings. */
- resultbuf->gr_name = p;
+ resbuf->gr_name = p;
p += gr_resp.gr_name_len;
- resultbuf->gr_passwd = p;
+ resbuf->gr_passwd = p;
p += gr_resp.gr_passwd_len;
/* Fill in what we know now. */
- resultbuf->gr_gid = gr_resp.gr_gid;
+ resbuf->gr_gid = gr_resp.gr_gid;
/* Allocate array to store lengths. */
len = (uint32_t *) alloca (gr_resp.gr_mem_cnt * sizeof (uint32_t));
@@ -133,7 +133,7 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type,
total_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
vec[0].iov_base = len;
vec[0].iov_len = total_len;
- vec[1].iov_base = resultbuf->gr_name;
+ vec[1].iov_base = resbuf->gr_name;
vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
total_len += gr_resp.gr_name_len + gr_resp.gr_passwd_len;
@@ -143,13 +143,13 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type,
goto out;
/* Clear the terminating entry. */
- resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
+ resbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
/* Prepare reading the group members. */
total_len = 0;
for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
{
- resultbuf->gr_mem[cnt] = p;
+ resbuf->gr_mem[cnt] = p;
total_len += len[cnt];
p += len[cnt];
}
@@ -157,17 +157,21 @@ nscd_getgr_r (const char *key, size_t keylen, request_type type,
if (__builtin_expect (total_len > buflen, 0))
goto no_room;
- retval = 0;
- n = TEMP_FAILURE_RETRY (__read (sock, resultbuf->gr_mem[0],
- total_len));
- if (__builtin_expect (n != total_len, 0))
+ if (gr_resp.gr_mem_cnt > 0
+ && __builtin_expect (TEMP_FAILURE_RETRY (__read (sock,
+ resbuf->gr_mem[0],
+ total_len))
+ != total_len, 0))
{
/* The `errno' to some value != ERANGE. */
__set_errno (ENOENT);
retval = ENOENT;
}
else
- *result = resultbuf;
+ {
+ retval = 0;
+ *result = resbuf;
+ }
}
else
{