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cmd/usb_mass_storage.c: Rework ums_init() ret logic slightly

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Previously, ret could be used uninitialized if
blk_get_device_part_str() failed.  Default to ret being set to -1 so
that we always return an err up if we have a problem and then invert the
logic on testing ums_count as when that is non-zero is the time we can
return 0.

Cc: John Tobias <john.tobias.ph@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Tom Rini 2016-04-20 10:59:32 -04:00
parent eb6b50f631
commit a238b0dacf
1 changed files with 5 additions and 13 deletions
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18
cmd/usb_mass_storage.c
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@ -56,7 +56,7 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
struct blk_desc *block_dev; struct blk_desc *block_dev;
disk_partition_t info; disk_partition_t info;
int partnum; int partnum;
int ret; int ret = -1;
struct ums *ums_new; struct ums *ums_new;
s = strdup(devnums_part_str); s = strdup(devnums_part_str);
@ -85,16 +85,12 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
partnum = 0; partnum = 0;
/* f_mass_storage.c assumes SECTOR_SIZE sectors */ /* f_mass_storage.c assumes SECTOR_SIZE sectors */
if (block_dev->blksz != SECTOR_SIZE) { if (block_dev->blksz != SECTOR_SIZE)
ret = -1;
goto cleanup; goto cleanup;
}
ums_new = realloc(ums, (ums_count + 1) * sizeof(*ums)); ums_new = realloc(ums, (ums_count + 1) * sizeof(*ums));
if (!ums_new) { if (!ums_new)
ret = -1;
goto cleanup; goto cleanup;
}
ums = ums_new; ums = ums_new;
/* if partnum = 0, expose all partitions */ /* if partnum = 0, expose all partitions */
@ -110,10 +106,8 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
ums[ums_count].write_sector = ums_write_sector; ums[ums_count].write_sector = ums_write_sector;
name = malloc(UMS_NAME_LEN); name = malloc(UMS_NAME_LEN);
if (!name) { if (!name)
ret = -1;
goto cleanup; goto cleanup;
}
snprintf(name, UMS_NAME_LEN, "UMS disk %d", ums_count); snprintf(name, UMS_NAME_LEN, "UMS disk %d", ums_count);
ums[ums_count].name = name; ums[ums_count].name = name;
ums[ums_count].block_dev = *block_dev; ums[ums_count].block_dev = *block_dev;
@ -127,9 +121,7 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
ums_count++; ums_count++;
} }
if (!ums_count) if (ums_count)
ret = -1;
else
ret = 0; ret = 0;
cleanup: cleanup: