fbarray: fix log message on truncation error

[ upstream commit 2a2ebea ]

When file truncation fails, the log message attempts to print a path of
file we failed to truncate, but this path was never set to anything and,
what's worse, was uninitialized. Fix it by passing path from the caller.

Coverity issue: 366122
Fixes: c44d098 ("eal: add shared indexed file-backed array")

Reported-by: Andrew Boyer <aboyer@pensando.io>
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

lib/librte_eal/common/eal_common_fbarray.c

@@ -80,9 +80,8 @@ get_used_mask(void *data, unsigned int elt_sz, unsigned int len)
 }
 
 static int
-resize_and_map(int fd, void *addr, size_t len)
+resize_and_map(int fd, const char *path, void *addr, size_t len)
 {
-	char path[PATH_MAX];
 	void *map_addr;
 
 	if (ftruncate(fd, len)) {
@@ -794,7 +793,7 @@ rte_fbarray_init(struct rte_fbarray *arr, const char *name, unsigned int len,
 			goto fail;
 		}
 
-		if (resize_and_map(fd, data, mmap_len))
+		if (resize_and_map(fd, path, data, mmap_len))
 			goto fail;
 	}
 	ma->addr = data;
@@ -900,7 +899,7 @@ rte_fbarray_attach(struct rte_fbarray *arr)
 		goto fail;
 	}
 
-	if (resize_and_map(fd, data, mmap_len))
+	if (resize_and_map(fd, path, data, mmap_len))
 		goto fail;
 
 	/* store our new memory area */