commit ac266e2edc4f40eef810d52c72657b645e4010db

Author: Ondrej Mosnacek <omosnace@redhat.com>

Date:   Tue Apr 6 15:57:37 2021 -0400

    exportfs: fix unexporting of '/'

    The code that has been added to strip trailing slashes from path in

    unexportfs_parsed() forgot to account for the case of the root

    directory, which is simply '/'. In that case it accesses path[-1] and

    reduces the path to an empty string, which then fails to match any

    export.

    Fix it by stopping the stripping when the path is just a single

    character - it doesn't matter if it's a '/' or not, we want to keep it

    either way in that case.

    Reproducer:

        exportfs localhost:/

        exportfs -u localhost:/

    Without this patch, the unexport step fails with "exportfs: Could not

    find 'localhost:/' to unexport."

    Fixes: a9a7728d8743 ("exportfs: Deal with path's trailing "/" in unexportfs_parsed()")

    Link: https://bugzilla.redhat.com/show_bug.cgi?id=1941171

    Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

    Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c

index 262dd19a..25d757d8 100644

--- a/utils/exportfs/exportfs.c

+++ b/utils/exportfs/exportfs.c

@@ -383,7 +383,7 @@ unexportfs_parsed(char *hname, char *path, int verbose)

 	 * so need to deal with it.

 	*/

 	size_t nlen = strlen(path);

-	while (path[nlen - 1] == '/')

+	while ((nlen > 1) && (path[nlen - 1] == '/'))

 		nlen--;

 	for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {