From bcb846f30f9ca8f42e79d109706aee9f2032261b Mon Sep 17 00:00:00 2001 From: Mike Gilbert Date: Wed, 22 May 2019 10:31:01 -0400 Subject: [PATCH] shared/machine-image: avoid passing NULL to log_debug_errno Fixes: https://github.com/systemd/systemd/issues/12534 --- src/shared/machine-image.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/src/shared/machine-image.c b/src/shared/machine-image.c index 6b9d8fb97a..6a6d952b42 100644 --- a/src/shared/machine-image.c +++ b/src/shared/machine-image.c @@ -201,11 +201,13 @@ static int image_make( Image **ret) { _cleanup_free_ char *pretty_buffer = NULL; + _cleanup_free_ char *cwd = NULL; struct stat stbuf; bool read_only; int r; assert(dfd >= 0 || dfd == AT_FDCWD); + assert(path || dfd == AT_FDCWD); assert(filename); /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block @@ -221,6 +223,9 @@ static int image_make( st = &stbuf; } + if (!path) + safe_getcwd(&cwd); + read_only = (path && path_startswith(path, "/usr")) || (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); @@ -359,7 +364,7 @@ static int image_make( block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); if (block_fd < 0) - log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename); + log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(cwd), filename); else { /* Refresh stat data after opening the node */ if (fstat(block_fd, &stbuf) < 0) @@ -373,13 +378,13 @@ static int image_make( int state = 0; if (ioctl(block_fd, BLKROGET, &state) < 0) - log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename); + log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(cwd), filename); else if (state) read_only = true; } if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) - log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path, filename); + log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(cwd), filename); block_fd = safe_close(block_fd); }