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partitions/aix: fix usage of uninitialized lv_info and lvname structures

[ Upstream commit 14cb2c8 ]

The if-block that sets a successful return value in aix_partition()
uses 'lvip[].pps_per_lv' and 'n[].name' potentially uninitialized.

For example, if 'numlvs' is zero or alloc_lvn() fails, neither is
initialized, but are used anyway if alloc_pvd() succeeds after it.

So, make the alloc_pvd() call conditional on their initialization.

This has been hit when attaching an apparently corrupted/stressed
AIX LUN, misleading the kernel to pr_warn() invalid data and hang.

    [...] partition (null) (11 pp's found) is not contiguous
    [...] partition (null) (2 pp's found) is not contiguous
    [...] partition (null) (3 pp's found) is not contiguous
    [...] partition (null) (64 pp's found) is not contiguous

Fixes: 6ceea22 ("partitions: add aix lvm partition support files")
Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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mfoliveira authored and gregkh committed Jul 26, 2018
1 parent f3677a5 commit 5deea7d63ba14027cee70936881c4d9171d8fa30
Showing with 3 additions and 2 deletions.
  1. +3 −2 block/partitions/aix.c
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@@ -178,7 +178,7 @@ int aix_partition(struct parsed_partitions *state)
u32 vgda_sector = 0;
u32 vgda_len = 0;
int numlvs = 0;
struct pvd *pvd;
struct pvd *pvd = NULL;
struct lv_info {
unsigned short pps_per_lv;
unsigned short pps_found;
@@ -232,10 +232,11 @@ int aix_partition(struct parsed_partitions *state)
if (lvip[i].pps_per_lv)
foundlvs += 1;
}
/* pvd loops depend on n[].name and lvip[].pps_per_lv */
pvd = alloc_pvd(state, vgda_sector + 17);
}
put_dev_sector(sect);
}
pvd = alloc_pvd(state, vgda_sector + 17);
if (pvd) {
int numpps = be16_to_cpu(pvd->pp_count);
int psn_part1 = be32_to_cpu(pvd->psn_part1);

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