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libefi: efi_get_devname: don't allocate procfs path 

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12048
This commit is contained in:
наб 2021-05-25 21:03:56 +02:00 committed by Tony Hutter
parent 1a4030b1b5
commit dec1ea4dbc
1 changed files with 3 additions and 10 deletions
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13
lib/libefi/rdwr_efi.c
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@ -218,22 +218,15 @@ read_disk_info(int fd, diskaddr_t *capacity, uint_t *lbsize)
static char * static char *
efi_get_devname(int fd) efi_get_devname(int fd)
{ {
char *path; char path[32];
char *dev_name;
path = calloc(1, PATH_MAX);
if (path == NULL)
return (NULL);
/* /*
* The libefi API only provides the open fd and not the file path. * The libefi API only provides the open fd and not the file path.
* To handle this realpath(3) is used to resolve the block device * To handle this realpath(3) is used to resolve the block device
* name from /proc/self/fd/<fd>. * name from /proc/self/fd/<fd>.
*/ */
(void) sprintf(path, "/proc/self/fd/%d", fd); (void) snprintf(path, sizeof (path), "/proc/self/fd/%d", fd);
dev_name = realpath(path, NULL); return (realpath(path, NULL));
free(path);
return (dev_name);
} }
static int static int