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From dd73c8a2f5e8da3c38f6e16c63f249071d440378 Mon Sep 17 00:00:00 2001
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From: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
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Date: Thu, 7 Dec 2017 20:59:54 +0200
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Subject: [PATCH 2/2] depmod: module_is_higher_priority: fix modname length
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calculation
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depmod_module_is_higher_priority checks module's path if it is under
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module root directory and if so uses relative to the root path to
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lookup the module in override and search lists.
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Originally only relative path was used in the function, so the
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variables with full path and and path length were changed:
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newpath += cfg->dirnamelen + 1;
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newlen -= cfg->dirnamelen + 1;
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oldpath += cfg->dirnamelen + 1;
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oldlen -= cfg->dirnamelen + 1;
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Commit 7da6884e7357ac05772e90f6d7e63b1948103fc4 (depmod: implement
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external directories support) changed the logic since it need the
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full path to the module for comparations as well.
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Unfortunately, it introduce a mistake in calculation of the relative
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paths replacing '-=' with assignment to a new variable -- the
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'cfg->dirnamelen + 1' value must be substracted all together. It
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breaks, for example, overrides lookup.
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Fix the calculation by putting braces around the value in the
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subsctuction expression.
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Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
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---
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tools/depmod.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/tools/depmod.c b/tools/depmod.c
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index 7ff3e9ed191e..921dc5cc93eb 100644
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--- a/tools/depmod.c
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+++ b/tools/depmod.c
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@@ -1118,11 +1118,11 @@ static int depmod_module_is_higher_priority(const struct depmod *depmod, const s
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if (strncmp(newpath, cfg->dirname, cfg->dirnamelen) == 0) {
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relnewpath = newpath + cfg->dirnamelen + 1;
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- relnewlen = newlen - cfg->dirnamelen + 1;
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+ relnewlen = newlen - (cfg->dirnamelen + 1);
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}
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if (strncmp(oldpath, cfg->dirname, cfg->dirnamelen) == 0) {
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reloldpath = oldpath + cfg->dirnamelen + 1;
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- reloldlen = oldlen - cfg->dirnamelen + 1;
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+ reloldlen = oldlen - (cfg->dirnamelen + 1);
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}
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for (ov = cfg->overrides; ov != NULL; ov = ov->next) {
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--
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2.15.1
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