diff options
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/boot.h | 14 | ||||
| -rw-r--r-- | arch/x86/boot/cmdline.c | 8 |
2 files changed, 16 insertions, 6 deletions
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 18997e5a1053..7fadf806f7ca 100644 --- a/arch/x86/boot/boot.h +++ b/arch/x86/boot/boot.h @@ -289,12 +289,22 @@ int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option); static inline int cmdline_find_option(const char *option, char *buffer, int bufsize) { - return __cmdline_find_option(boot_params.hdr.cmd_line_ptr, option, buffer, bufsize); + u32 cmd_line_ptr = boot_params.hdr.cmd_line_ptr; + + if (cmd_line_ptr >= 0x100000) + return -1; /* inaccessible */ + + return __cmdline_find_option(cmd_line_ptr, option, buffer, bufsize); } static inline int cmdline_find_option_bool(const char *option) { - return __cmdline_find_option_bool(boot_params.hdr.cmd_line_ptr, option); + u32 cmd_line_ptr = boot_params.hdr.cmd_line_ptr; + + if (cmd_line_ptr >= 0x100000) + return -1; /* inaccessible */ + + return __cmdline_find_option_bool(cmd_line_ptr, option); } diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c index 6b3b6f708c04..768f00f32469 100644 --- a/arch/x86/boot/cmdline.c +++ b/arch/x86/boot/cmdline.c @@ -41,8 +41,8 @@ int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int st_bufcpy /* Copying this to buffer */ } state = st_wordstart; - if (!cmdline_ptr || cmdline_ptr >= 0x100000) - return -1; /* No command line, or inaccessible */ + if (!cmdline_ptr) + return -1; /* No command line */ cptr = cmdline_ptr & 0xf; set_fs(cmdline_ptr >> 4); @@ -111,8 +111,8 @@ int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option) st_wordskip, /* Miscompare, skip */ } state = st_wordstart; - if (!cmdline_ptr || cmdline_ptr >= 0x100000) - return -1; /* No command line, or inaccessible */ + if (!cmdline_ptr) + return -1; /* No command line */ cptr = cmdline_ptr & 0xf; set_fs(cmdline_ptr >> 4); |