47 lines
1.3 KiB
Diff
47 lines
1.3 KiB
Diff
From f6fffc1a89e57b7d5dd4adf1ee6b2146e58ec411 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Thu, 17 Mar 2022 12:18:03 +0100
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Subject: lib/path: make ul_path_read_buffer() more robust [coverity scan]
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Make sure we never call buf[rc - 1] for rc=0.
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Upstream: http://github.com/util-linux/util-linux/commit/ea459dcf95d0bb04c816b71d2b85fbcd8cfc5ee4
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Addresses: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=2109459
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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lib/path.c | 17 ++++++++++-------
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1 file changed, 10 insertions(+), 7 deletions(-)
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diff --git a/lib/path.c b/lib/path.c
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index 21f9bd1c4..ab034e110 100644
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--- a/lib/path.c
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+++ b/lib/path.c
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@@ -666,14 +666,17 @@ int ul_path_readf_string(struct path_cxt *pc, char **str, const char *path, ...)
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int ul_path_read_buffer(struct path_cxt *pc, char *buf, size_t bufsz, const char *path)
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{
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int rc = ul_path_read(pc, buf, bufsz - 1, path);
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- if (rc < 0)
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- return rc;
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- /* Remove tailing newline (usual in sysfs) */
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- if (rc > 0 && *(buf + rc - 1) == '\n')
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- buf[--rc] = '\0';
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- else
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- buf[rc - 1] = '\0';
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+ if (rc == 0)
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+ buf[0] = '\0';
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+
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+ else if (rc > 0) {
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+ /* Remove tailing newline (usual in sysfs) */
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+ if (*(buf + rc - 1) == '\n')
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+ buf[--rc] = '\0';
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+ else
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+ buf[rc - 1] = '\0';
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+ }
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return rc;
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}
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--
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2.36.1
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