New Defects reported by Coverity Scan for Linux

[Andrea Adami]

On Mon, Nov 27, 2017 at 2:22 PM, Richard Weinberger <richard at nod.at> wrote:
> Andrea,
>
> please check. The same pattern seems to be used more than once in this driver.
>
> Thanks,
> //richard

Hello,
I acked the patch v2, considering 2 occurrences:

https://lkml.org/lkml/2017/11/8/567

I thought that was enough, what should I do now?
Thanks
Andrea


P.S.
Neverthless, imho it is impposible to overflow with the numbers we are using:

+ for (block_num = 0; block_num < phymax; block_num++) {
+ block_adr = block_num * mtd->erasesize;

#define SHARPSL_FTL_PART_SIZE (7 * SZ_1M)

for pxa25x : nand: 128 MiB, SLC, erase size: 16 KiB, page size: 512,
OOB size: 16
FTL blocks: 448 physical = 24 reserved + 424 logical
max block_adr = 447 * 16384

for pxa27x
nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
FTL blocks: 56 physical = 4 reserved + 52 logical
max block_adr = 55 * 131072


>
> ----------  Weitergeleitete Nachricht  ----------
>
> Betreff: New Defects reported by Coverity Scan for Linux
> Datum: Montag, 27. November 2017, 08:49:21 CET
> Von: scan-admin at coverity.com
> An: richard at nod.at
>
>
>
> Hi,
>
> Please find the latest report on new defect(s) introduced to Linux, under
> component 'Drivers-MTD',  found with Coverity Scan.
>
> 1 new defect(s) introduced to Linux, under component 'Drivers-MTD',  found
> with Coverity Scan.
> 344 defect(s), reported by Coverity Scan earlier, were marked fixed in the
> recent build analyzed by Coverity Scan.
>
> New defect(s) Reported-by: Coverity Scan
> Showing 1 of 1 defect(s)
>
>
> ** CID 1424016:  Integer handling issues  (OVERFLOW_BEFORE_WIDEN)
> /drivers/mtd/parsers/sharpslpart.c: 195 in sharpsl_nand_init_ftl()
>
>
> ________________________________________________________________________________________________________
> *** CID 1424016:  Integer handling issues  (OVERFLOW_BEFORE_WIDEN)
> /drivers/mtd/parsers/sharpslpart.c: 195 in sharpsl_nand_init_ftl()
> 189             /* initialize ftl->log2phy */
> 190             for (i = 0; i < ftl->logmax; i++)
> 191                     ftl->log2phy[i] = UINT_MAX;
> 192
> 193             /* create physical-logical table */
> 194             for (block_num = 0; block_num < phymax; block_num++) {
>>>>     CID 1424016:  Integer handling issues  (OVERFLOW_BEFORE_WIDEN)
>>>>     Potentially overflowing expression "block_num * mtd->erasesize" with
> type "unsigned int" (32 bits, unsigned) is evaluated using 32-bit arithmetic,
> and then used in a context that expects an expression of type "loff_t" (64
> bits, signed).
> 195                     block_adr = block_num * mtd->erasesize;
> 196
> 197                     if (mtd_block_isbad(mtd, block_adr))
> 198                             continue;
> 199
> 200                     if (sharpsl_nand_read_oob(mtd, block_adr, oob))
>
>
> ________________________________________________________________________________________________________
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> -------------------------------------------------------------