efi_loader: path length in efi_dp_from_name()

Before this patch efi_dp_from_name() only accommodated a maximum file path
length of 31 characters. This leads to boot failures due to file name
truncation.

Allow arbitrary path lengths.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 4b20859b2558f19f92fd8eaa5406ab090a12ff72..76c2f82fe661c8d44497e910ab6035830fcc6a66 100644 (file)
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -1171,7 +1171,7 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
        struct blk_desc *desc = NULL;
        struct disk_partition fs_partition;
        int part = 0;
-       char filename[32] = { 0 }; /* dp->str is u16[32] long */
+       char *filename;
        char *s;
 
        if (path && !file)
@@ -1198,12 +1198,17 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
        if (!path)
                return EFI_SUCCESS;
 
-       snprintf(filename, sizeof(filename), "%s", path);
+       filename = calloc(1, strlen(path) + 1);
+       if (!filename)
+               return EFI_OUT_OF_RESOURCES;
+
+       sprintf(filename, "%s", path);
        /* DOS style file path: */
        s = filename;
        while ((s = strchr(s, '/')))
                *s++ = '\\';
        *file = efi_dp_from_file(desc, part, filename);
+       free(filename);
 
        if (!*file)
                return EFI_INVALID_PARAMETER;