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From d9fe56d8da9015694fcba5f3dd850becff677ab5 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Fri, 20 Sep 2019 13:00:19 +0200
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Subject: [PATCH] libmount: use fmemopen() in more robust way [coverity scan]
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Upstream: http://github.com/karelzak/util-linux/commit/026f7d302066a4e6f5a69dc9818ec3180939f4a3
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Upstream: http://github.com/karelzak/util-linux/commit/bc747dfccf511419312ec872cefa90e25d83136a
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Addresses: http://bugzilla.redhat.com/show_bug.cgi?id=1751447
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libmount/src/utils.c | 18 ++++++++++++------
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1 file changed, 12 insertions(+), 6 deletions(-)
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diff --git a/libmount/src/utils.c b/libmount/src/utils.c
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index f7d85d124..04e79f53f 100644
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--- a/libmount/src/utils.c
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+++ b/libmount/src/utils.c
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@@ -1219,20 +1219,26 @@ success:
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*/
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FILE *mnt_get_procfs_memstream(int fd, char **membuf)
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{
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- FILE *memf;
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size_t sz = 0;
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off_t cur;
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+ *membuf = NULL;
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+
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/* in case of error, rewind to the original position */
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cur = lseek(fd, 0, SEEK_CUR);
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- if (read_procfs_file(fd, membuf, &sz) == 0
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- && sz > 0
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- && (memf = fmemopen(*membuf, sz, "r")))
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- return memf;
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+ if (read_procfs_file(fd, membuf, &sz) == 0 && sz > 0) {
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+ FILE *memf = fmemopen(*membuf, sz, "r");
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+ if (memf)
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+ return memf; /* success */
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+
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+ free(*membuf);
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+ *membuf = NULL;
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+ }
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/* error */
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- lseek(fd, cur, SEEK_SET);
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+ if (cur != (off_t) -1)
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+ lseek(fd, cur, SEEK_SET);
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return NULL;
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}
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#else
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--
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2.21.0
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