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From a0c57f8759a0548aa7f0334f6839156b1456bb2a Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Wed, 13 Jun 2018 09:57:49 -0400
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Subject: [PATCH 2/2] libfwup: set_up_boot_next(): make sure we check if our
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file paths are NULL.
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Coverity's clang scan believes we can sometimes alloca(0) if
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fwup_esp_path is NULL, though I don't think this can happen because if
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it is NULL get_paths() should have returned error. Nevertheless, just
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check both things.
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Additionally, this adds a check to make sure utf8_to_ucs2() and
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ucs2len() didn't fail.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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linux/libfwup.c | 19 +++++++++++++++----
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1 file changed, 15 insertions(+), 4 deletions(-)
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diff --git a/linux/libfwup.c b/linux/libfwup.c
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index abab18e96ac..61a9d280c32 100644
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--- a/linux/libfwup.c
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+++ b/linux/libfwup.c
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@@ -1215,9 +1215,9 @@ set_up_boot_next(void)
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uint32_t attributes = LOAD_OPTION_ACTIVE;
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rc = get_paths(&shim_fs_path, &fwup_fs_path, &fwup_esp_path);
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- if (rc < 0) {
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+ if (rc < 0 || (!shim_fs_path && (!fwup_fs_path || !fwup_esp_path))) {
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efi_error("could not find paths for shim and fwup");
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- return -1;
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+ goto out;
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}
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if (!shim_fs_path)
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@@ -1242,9 +1242,20 @@ set_up_boot_next(void)
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if (!use_fwup_path) {
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loader_str = utf8_to_ucs2((uint8_t *)fwup_esp_path, -1);
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+ if (loader_str == NULL) {
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+ efi_error("utf8_to_ucs2() failed");
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+ goto out;
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+ }
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loader_sz = ucs2len(loader_str, -1) * 2;
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- if (loader_sz)
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- loader_sz += 2;
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+ if (loader_sz < 2) {
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+ efi_error("ucs2len(fwup_esp_path) returned %zu",
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+ loader_sz);
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+ saved_errno = errno;
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+ free(loader_str);
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+ errno = saved_errno;
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+ goto out;
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+ }
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+ loader_sz += 2;
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loader_str = onstack(loader_str, loader_sz);
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}
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--
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2.17.1
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