kbuild: fix segfault in modpost
Fix modpost segfault.
Before:
-------
ynezz@ntbk:~/linux-2.6.git$ scripts/mod/modpost vmlinux ath_pci.o
Segmentation fault
After:
------
ynezz@ntbk:~/linux-2.6.git$ scripts/mod/modpost vmlinux ath_pci.o
FATAL: section header offset=815726848 in file 'ath_pci.o' is bigger then filesize=153968
Sam: This seems to warn for a binutils issue. Anyway modpost should not
segfault.
Signed-off-by: Petr Stetiar <ynezz@true.cz>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 0a4051f..2ef9a19 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -381,6 +381,12 @@
sechdrs = (void *)hdr + hdr->e_shoff;
info->sechdrs = sechdrs;
+ /* Check if file offset is correct */
+ if (hdr->e_shoff > info->size) {
+ fatal("section header offset=%u in file '%s' is bigger then filesize=%lu\n", hdr->e_shoff, filename, info->size);
+ return 0;
+ }
+
/* Fix endianness in section headers */
for (i = 0; i < hdr->e_shnum; i++) {
sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);