diff options
Diffstat (limited to 'source3/lib/util.c')
| -rw-r--r-- | source3/lib/util.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/source3/lib/util.c b/source3/lib/util.c index 64afa1cc53..b1db36c250 100644 --- a/source3/lib/util.c +++ b/source3/lib/util.c @@ -3127,6 +3127,8 @@ int this_is_smp(void) /**************************************************************** Check if an offset into a buffer is safe. + If this returns True it's safe to indirect into the byte at + pointer ptr+off. ****************************************************************/ BOOL is_offset_safe(const char *buf_base, size_t buf_len, char *ptr, size_t off) @@ -3180,10 +3182,14 @@ char *get_safe_str_ptr(const char *buf_base, size_t buf_len, char *ptr, size_t o int get_safe_SVAL(const char *buf_base, size_t buf_len, char *ptr, size_t off, int failval) { - if (!is_offset_safe(buf_base, buf_len, ptr, off+2)) { + /* + * Note we use off+1 here, not off+2 as SVAL accesses ptr[0] and ptr[1], + * NOT ptr[2]. + */ + if (!is_offset_safe(buf_base, buf_len, ptr, off+1)) { return failval; } - return SVAL(ptr,0); + return SVAL(ptr,off); } /**************************************************************** @@ -3192,8 +3198,12 @@ int get_safe_SVAL(const char *buf_base, size_t buf_len, char *ptr, size_t off, i int get_safe_IVAL(const char *buf_base, size_t buf_len, char *ptr, size_t off, int failval) { - if (!is_offset_safe(buf_base, buf_len, ptr, off+4)) { + /* + * Note we use off+3 here, not off+4 as IVAL accesses + * ptr[0] ptr[1] ptr[2] ptr[3] NOT ptr[4]. + */ + if (!is_offset_safe(buf_base, buf_len, ptr, off+3)) { return failval; } - return IVAL(ptr,0); + return IVAL(ptr,off); } |