Re: [CHECKER] 5 additional buffer overruns in 2.5.48

From: Jeff Garzik (jgarzik@pobox.com)
Date: Sat Nov 30 2002 - 18:41:35 EST


Andy Chou wrote:
> Here are 6 additional potential buffer overruns in 2.4.58. Again, we
> would appreciate feedback on whether these are really errors or not.
>
> -Andy
>
>
> ---------------------------------------------------------
> [BUG] Forgot to malloc?
> /u1/acc/linux/2.5.48/fs/cifs/cifssmb.c:233:CIFSSMBLogoff:
> ERROR:BUFFER:233:233:Deref uninitialized pointer pSMB
> if (atomic_read(&ses->inUse) > 0) {
> up(&ses->sesSem);
> return -EBUSY;
> }
> if(ses->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
>
> Error --->
> pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
> rc = smb_init(SMB_COM_LOGOFF_ANDX, 2, 0 /* no tcon anymore */ ,
> (void **) &pSMB, (void **) &smb_buffer_response);
> if (rc) {
> ---------------------------------------------------------
> [BUG] [GEM] base starts at offset 4 of buf
> /u1/acc/linux/2.5.48/drivers/cdrom/cdrom.c:1170:dvd_read_physical:
> ERROR:BUFFER:1170:1170:Array bounds error: base[16] indexed with [16]
> layer->track_density = base[3] & 0xf;
> layer->linear_density = base[3] >> 4;
> layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
> layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
> layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
>
> Error --->
> layer->bca = base[16] >> 7;
>
> return 0;
> }
> ---------------------------------------------------------
> [BUG] Probably forgot to malloc in first branch.
> /u1/acc/linux/2.5.48/drivers/video/sstfb.c:795:sstfb_get_fix:
> ERROR:BUFFER:795:795:Deref uninitialized pointer var
> fix->visual = FB_VISUAL_TRUECOLOR;
> /*
> * According to the specs, the linelength must be of 1024
> *pixels*.
> * and the 24bpp mode is in fact a 32 bpp mode.
> */
>
> Error --->
> fix->line_length = (var->bits_per_pixel == 16) ? 2048 : 4096 ;
> return 0;
> #undef sst_info
> }
> ---------------------------------------------------------
> [BUG] Complex.
> /u1/acc/linux/2.5.48/drivers/net/sunhme.c:3218:happy_meal_pci_init:
> ERROR:BUFFER:3218:3218:Array bounds error: qp->happy_meals[4] indexed with
> [-1]
> err_out_free_res:
> pci_release_regions(pdev);
>
> err_out_clear_quattro:
> if (qp != NULL)
>
> Error --->
> qp->happy_meals[qfe_slot] = NULL;
>

notabug, qfe_slot is clearly initialized to zero before this code is hit.

> ---------------------------------------------------------
> [BUG]
> /u1/acc/linux/2.5.48/drivers/net/ni52.c:1133:ni52_timeout:
> ERROR:BUFFER:1133:1133:Array bounds error: p->xmit_cmds[1] indexed with
> [1]

bug, fixed.

> ---------------------------------------------------------
> [BUG]
> /u1/acc/linux/2.5.48/drivers/net/3c523.c:1102:elmc_timeout:
> ERROR:BUFFER:1102:1102:Array bounds error: p->xmit_cmds[1] indexed with
> [1]

bug, fixed.

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