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authorWolfgang Denk <wd@denx.de>2010-06-28 22:00:46 +0200
committerWolfgang Denk <wd@denx.de>2010-07-04 23:55:42 +0200
commit54841ab50c20d6fa6c9cc3eb826989da3a22d934 (patch)
tree400f22f0a12ff0ae6c472bed6ac648befc1744a2 /common/lcd.c
parentb218ccb5435e64ac2318bb8b6c9594ef1cc724cd (diff)
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Make sure that argv[] argument pointers are not modified.
The hush shell dynamically allocates (and re-allocates) memory for the argument strings in the "char *argv[]" argument vector passed to commands. Any code that modifies these pointers will cause serious corruption of the malloc data structures and crash U-Boot, so make sure the compiler can check that no such modifications are being done by changing the code into "char * const argv[]". This modification is the result of debugging a strange crash caused after adding a new command, which used the following argument processing code which has been working perfectly fine in all Unix systems since version 6 - but not so in U-Boot: int main (int argc, char **argv) { while (--argc > 0 && **++argv == '-') { /* ====> */ while (*++*argv) { switch (**argv) { case 'd': debug++; break; ... default: usage (); } } } ... } The line marked "====>" will corrupt the malloc data structures and usually cause U-Boot to crash when the next command gets executed by the shell. With the modification, the compiler will prevent this with an error: increment of read-only location '*argv' N.B.: The code above can be trivially rewritten like this: while (--argc > 0 && **++argv == '-') { char *arg = *argv; while (*++arg) { switch (*arg) { ... Signed-off-by: Wolfgang Denk <wd@denx.de> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'common/lcd.c')
-rw-r--r--common/lcd.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/common/lcd.c b/common/lcd.c
index 64fb1c6..93ddedf 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -78,7 +78,7 @@ static inline void lcd_putc_xy (ushort x, ushort y, uchar c);
static int lcd_init (void *lcdbase);
-static int lcd_clear (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]);
+static int lcd_clear (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]);
static void *lcd_logo (void);
static int lcd_getbgcolor (void);
@@ -350,7 +350,7 @@ int drv_lcd_init (void)
}
/*----------------------------------------------------------------------*/
-static int lcd_clear (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static int lcd_clear (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
#if LCD_BPP == LCD_MONOCHROME
/* Setting the palette */