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efi_loader: path length in efi_dp_from_name()

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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>
This commit is contained in:
Heinrich Schuchardt 2021-05-25 12:07:30 +02:00
parent f6081a8a1e
commit 9a6b33bef2
1 changed files with 7 additions and 2 deletions
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9
lib/efi_loader/efi_device_path.c
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@ -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;