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[Qemu-devel] [PATCH STABLE 2/2] net: Fix -net socket parameter checks
From: |
Glauber Costa |
Subject: |
[Qemu-devel] [PATCH STABLE 2/2] net: Fix -net socket parameter checks |
Date: |
Wed, 20 May 2009 20:44:30 -0400 |
My commit ea053add700d8abe203cd79a9ffb082aee4eabc0 broke -net socket by
overwriting an intermediate buffer in the added check_param. Fix this
by switching check_param to automatic buffer allocation and release, ie.
callers no longer have to worry about providing a scratch buffer.
Signed-off-by: Jan Kiszka <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
Signed-off-by: Glauber Costa <address@hidden>
---
sysemu.h | 3 +--
vl.c | 32 +++++++++++++++++++++++---------
2 files changed, 24 insertions(+), 11 deletions(-)
diff --git a/sysemu.h b/sysemu.h
index 57217c1..3cc36b5 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -245,7 +245,6 @@ const char *get_opt_name(char *buf, int buf_size, const
char *p);
const char *get_opt_value(char *buf, int buf_size, const char *p);
int get_param_value(char *buf, int buf_size,
const char *tag, const char *str);
-int check_params(char *buf, int buf_size,
- const char * const *params, const char *str);
+int check_params(const char * const *params, const char *str);
#endif
diff --git a/vl.c b/vl.c
index 56623fb..1a7e609 100644
--- a/vl.c
+++ b/vl.c
@@ -1918,29 +1918,43 @@ int get_param_value(char *buf, int buf_size,
return 0;
}
-int check_params(char *buf, int buf_size,
- const char * const *params, const char *str)
+int check_params(const char * const *params, const char *str)
{
+ int name_buf_size = 1;
const char *p;
- int i;
+ char *name_buf;
+ int i, len;
+ int ret = 0;
+
+ for (i = 0; params[i] != NULL; i++) {
+ len = strlen(params[i]) + 1;
+ if (len > name_buf_size) {
+ name_buf_size = len;
+ }
+ }
+ name_buf = qemu_malloc(name_buf_size);
p = str;
for(;;) {
- p = get_opt_name(buf, buf_size, p);
+ p = get_opt_name(name_buf, name_buf_size, p);
if (*p != '=')
return -1;
p++;
for(i = 0; params[i] != NULL; i++)
- if (!strcmp(params[i], buf))
+ if (!strcmp(params[i], name_buf))
break;
- if (params[i] == NULL)
- return -1;
+ if (params[i] == NULL) {
+ ret = -1;
+ break;
+ }
p = get_opt_value(NULL, 0, p);
if (*p != ',')
break;
p++;
}
- return 0;
+
+ qemu_free(name_buf);
+ return ret;
}
/***********************************************************/
@@ -2297,7 +2311,7 @@ int drive_init(struct drive_opt *arg, int snapshot, void
*opaque)
"cache", "format", "serial",
"werror",
NULL };
- if (check_params(buf, sizeof(buf), params, str) < 0) {
+ if (check_params(params, str) < 0) {
fprintf(stderr, "qemu: unknown parameter '%s' in '%s'\n",
buf, str);
return -1;
--
1.5.6.6
- [Qemu-devel] [PATCH STABLE 0/2] Backport -net socket fixes, Glauber Costa, 2009/05/20
- [Qemu-devel] [PATCH STABLE 1/2] net: Fix -net socket, listen (Jan Kiszka), Glauber Costa, 2009/05/20
- [Qemu-devel] [PATCH STABLE 2/2] net: Fix -net socket parameter checks,
Glauber Costa <=
- [Qemu-devel] Re: [PATCH STABLE 2/2] net: Fix -net socket parameter checks, Jan Kiszka, 2009/05/21
- [Qemu-devel] Re: [PATCH STABLE 2/2] net: Fix -net socket parameter checks, Glauber Costa, 2009/05/21
- [Qemu-devel] Re: [PATCH STABLE 2/2] net: Fix -net socket parameter checks, Jan Kiszka, 2009/05/21
- [Qemu-devel] Re: [PATCH STABLE 2/2] net: Fix -net socket parameter checks, Glauber Costa, 2009/05/21
- [Qemu-devel] Re: [PATCH STABLE 2/2] net: Fix -net socket parameter checks, Jan Kiszka, 2009/05/21