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kernel: Fix environment pointer setup in ar71xx/ath79

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Observed on ar71xx/ath79 platforms such as Ubiquiti RouterStations.Reported in #20642.:
(https://dev.openwrt.org/ticket/20642).

If embedded command-line text exists with CONFIG_IMAGE_CMDLINE_HACK=y,firmware
init doesn't initialize environment pointer (fw_init_cmdline not called).

arcs_cmdline is not initialized before calling strlcat.

Signed-off-by: Ted Hess <thess@kitschensync.net>
Tested-by: Stijn Tintel <stijn@linux-ipv6.be>

SVN-Revision: 47270
This commit is contained in:
John Crispin 2015-10-26 10:39:41 +00:00
parent 06b032d6dc
commit c89fc7a75a
1 changed files with 19 additions and 3 deletions
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22
target/linux/ar71xx/patches-4.1/508-MIPS-ath79-prom-image-command-line-hack.patch
View file

@ -1,6 +1,6 @@
--- a/arch/mips/ath79/prom.c
+++ b/arch/mips/ath79/prom.c
@@ -33,6 +33,35 @@ static void __init ath79_prom_append_cmd
@@ -33,6 +33,41 @@ static void __init ath79_prom_append_cmd
strlcat(arcs_cmdline, ath79_cmdline_buf, sizeof(arcs_cmdline));
}
@ -27,6 +27,12 @@
+ strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
+ }
+
+ /* Validate and setup environment pointer */
+ if (fw_arg2 < CKSEG0)
+ _fw_envp = NULL;
+ else
+ _fw_envp = (int *)fw_arg2;
+
+ return 1;
+}
+#else
@ -36,7 +42,7 @@
static int __init ath79_prom_init_myloader(void)
{
struct myloader_info *mylo;
@@ -61,6 +90,8 @@ static int __init ath79_prom_init_myload
@@ -61,6 +96,8 @@ static int __init ath79_prom_init_myload
ath79_prom_append_cmdline("ethaddr", mac_buf);
@ -45,7 +51,7 @@
return 1;
}
@@ -71,7 +102,8 @@ void __init prom_init(void)
@@ -71,7 +108,8 @@ void __init prom_init(void)
if (ath79_prom_init_myloader())
return;
@ -55,3 +61,13 @@
env = fw_getenv("ethaddr");
if (env)
--- a/arch/mips/fw/lib/cmdline.c
+++ b/arch/mips/fw/lib/cmdline.c
@@ -35,6 +35,7 @@ void __init fw_init_cmdline(void)
else
_fw_envp = (int *)fw_arg2;
+ arcs_cmdline[0] = '\0';
for (i = 1; i < fw_argc; i++) {
strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
if (i < (fw_argc - 1))