82 lines
2.5 KiB
Diff
82 lines
2.5 KiB
Diff
From 9a1c801a1a3c102bf95c5339c9e985b26b823a21 Mon Sep 17 00:00:00 2001
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From: Stephen Gallagher <[email protected]>
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Date: Tue, 6 Jan 2026 14:19:30 -0500
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Subject: [PATCH] Fix discarded const qualifiers
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It's unsafe to implicitly discard the const qualifier on a pointer. In
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overlay_fixup_phandle(), this was probably just an oversight, and making
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the "sep" variable a const char * is sufficient to fix it.
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In create_node(), however, the "p" variable is directly modifying the
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buffer pointed to by "const char* node_name". To fix this, we need to
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actually make a duplicate of the buffer and operate on that instead.
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This introduces a malloc()/free() and an unbounded strdup() into the
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operation, but fdtput isn't a long-running service and the node_name
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argument comes directly from argv, so this shouldn't introduce a
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significant performance impact.
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Signed-off-by: Stephen Gallagher <[email protected]>
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Signed-off-by: David Gibson <[email protected]>
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---
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fdtput.c | 8 +++++---
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libfdt/fdt_overlay.c | 3 ++-
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meson.build | 1 +
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3 files changed, 8 insertions(+), 4 deletions(-)
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diff --git a/fdtput.c b/fdtput.c
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index 05f2b933..fdb581a2 100644
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--- a/fdtput.c
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+++ b/fdtput.c
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@@ -254,19 +254,21 @@ static int create_paths(char **blob, const char *in_path)
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static int create_node(char **blob, const char *node_name)
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{
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int node = 0;
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- char *p;
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+ const char *p;
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+ char *path = NULL;
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p = strrchr(node_name, '/');
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if (!p) {
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report_error(node_name, -1, -FDT_ERR_BADPATH);
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return -1;
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}
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- *p = '\0';
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*blob = realloc_node(*blob, p + 1);
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if (p > node_name) {
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- node = fdt_path_offset(*blob, node_name);
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+ path = xstrndup(node_name, (size_t)(p - node_name));
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+ node = fdt_path_offset(*blob, path);
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+ free(path);
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if (node < 0) {
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report_error(node_name, -1, node);
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return -1;
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diff --git a/libfdt/fdt_overlay.c b/libfdt/fdt_overlay.c
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index e6b9eb64..51a38596 100644
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--- a/libfdt/fdt_overlay.c
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+++ b/libfdt/fdt_overlay.c
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@@ -407,7 +407,8 @@ static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,
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const char *fixup_str = value;
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uint32_t path_len, name_len;
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uint32_t fixup_len;
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- char *sep, *endptr;
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+ const char *sep;
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+ char *endptr;
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int poffset, ret;
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fixup_end = memchr(value, '\0', len);
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diff --git a/meson.build b/meson.build
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index 66b44e87..501b706c 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -18,6 +18,7 @@ add_project_arguments(
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'-Wshadow',
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'-Wsuggest-attribute=format',
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'-Wwrite-strings',
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+ '-Wdiscarded-qualifiers',
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]),
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language: 'c'
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)
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