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[PATCH v1 1/7] elf-ops: bail out if we have no function symbols
From: |
Alex Bennée |
Subject: |
[PATCH v1 1/7] elf-ops: bail out if we have no function symbols |
Date: |
Fri, 27 Mar 2020 09:49:39 +0000 |
It's perfectly possible to have no function symbols in your elf file
and if we do the undefined behaviour sanitizer rightly complains about
us passing NULL to qsort. Check nsyms before we go ahead.
Signed-off-by: Alex Bennée <address@hidden>
---
include/hw/elf_ops.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
index a1411bfcab6..b5d4074d1e3 100644
--- a/include/hw/elf_ops.h
+++ b/include/hw/elf_ops.h
@@ -170,8 +170,13 @@ static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int
fd, int must_swab,
}
i++;
}
- syms = g_realloc(syms, nsyms * sizeof(*syms));
+ /* check we have symbols left */
+ if (nsyms == 0) {
+ goto fail;
+ }
+
+ syms = g_realloc(syms, nsyms * sizeof(*syms));
qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
for (i = 0; i < nsyms - 1; i++) {
if (syms[i].st_size == 0) {
--
2.20.1