diff options
| author | Mark Wielaard <[email protected]> | 2018-06-05 22:27:25 +0200 |
|---|---|---|
| committer | Mark Wielaard <[email protected]> | 2018-06-08 12:03:14 +0200 |
| commit | 7009db70ca21d2b26cabd1c9fa1a50c35b6342b1 (patch) | |
| tree | 87a21dfc259c0ab4990e1355d13d3332c7cd1894 /libdw/dwarf_getsrclines.c | |
| parent | 50478b80cede080891996cf080581ca2a0611ce8 (diff) | |
libdw: Make sure dirarray is always properly freed in dwarf_getsrclines.
If there were more than 256 directories in the table and there was
illegal DWARF before we read them all, then we might not free the
dirarray (or the wrong one). Fix by defining the dirarray early
(before the first data sanity check) and making sure it is not
(still) equal to dirstack before freeing.
Signed-off-by: Mark Wielaard <[email protected]>
Diffstat (limited to 'libdw/dwarf_getsrclines.c')
| -rw-r--r-- | libdw/dwarf_getsrclines.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/libdw/dwarf_getsrclines.c b/libdw/dwarf_getsrclines.c index 790d4e49..0c2efaa9 100644 --- a/libdw/dwarf_getsrclines.c +++ b/libdw/dwarf_getsrclines.c @@ -182,6 +182,17 @@ read_srclines (Dwarf *dbg, .discriminator = 0 }; + /* The dirs normally go on the stack, but if there are too many + we alloc them all. Set up stack storage early, so we can check on + error if we need to free them or not. */ + struct dirlist + { + const char *dir; + size_t len; + }; + struct dirlist dirstack[MAX_STACK_DIRS]; + struct dirlist *dirarray = dirstack; + if (unlikely (linep + 4 > lineendp)) { invalid_data: @@ -347,14 +358,6 @@ read_srclines (Dwarf *dbg, goto invalid_data; } - struct dirlist - { - const char *dir; - size_t len; - }; - struct dirlist dirstack[MAX_STACK_DIRS]; - struct dirlist *dirarray = dirstack; - /* Arrange the list in array form. */ ndirlist = ndirs; if (ndirlist >= MAX_STACK_DIRS) @@ -1051,7 +1054,7 @@ read_srclines (Dwarf *dbg, free (state.linelist); state.linelist = ll; } - if (ndirlist >= MAX_STACK_DIRS) + if (dirarray != dirstack) free (dirarray); for (size_t i = MAX_STACK_FILES; i < nfilelist; i++) { |