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Subject[PATCH] kmalloc checks for drivers/ide/ide-probe.c (244ac16)
Hi.

The following patch adds a number of checks for kmalloc returns
to drivers/ide/ide-probe.c. It applies against ac16.

One comment: This patch adds 'drive-present = 0' to the
code path for the EXABYTE case. I could not discern if this was a
shortcoming of the original code or not. Please comment.


--- linux-244-ac16-clean/drivers/ide/ide-probe.c Fri May 25 21:11:08 2001
+++ linux-244-ac16/drivers/ide/ide-probe.c Fri May 25 21:51:08 2001
@@ -58,6 +58,11 @@
struct hd_driveid *id;

id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_ATOMIC); /* called with interrupts disabled! */
+ if (!id) {
+ printk(KERN_WARNING "(ide-probe::do_identify) Out of memory.\n");
+ goto err_kmalloc;
+ }
+
ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
ide__sti(); /* local CPU only */
ide_fix_driveid(id);
@@ -76,8 +81,7 @@
if ((id->model[0] == 'P' && id->model[1] == 'M')
|| (id->model[0] == 'S' && id->model[1] == 'K')) {
printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
- drive->present = 0;
- return;
+ goto err_misc;
}
#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */

@@ -96,7 +100,7 @@
ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);

if (strstr(id->model, "E X A B Y T E N E S T"))
- return;
+ goto err_misc;

id->model[sizeof(id->model)-1] = '\0'; /* we depend on this a lot! */
printk("%s: %s, ", drive->name, id->model);
@@ -111,8 +115,7 @@
#ifdef CONFIG_BLK_DEV_PDC4030
if (HWIF(drive)->channel == 1 && HWIF(drive)->chipset == ide_pdc4030) {
printk(" -- not supported on 2nd Promise port\n");
- drive->present = 0;
- return;
+ goto err_misc;
}
#endif /* CONFIG_BLK_DEV_PDC4030 */
switch (type) {
@@ -174,6 +177,12 @@
printk("ATA DISK drive\n");
QUIRK_LIST(HWIF(drive),drive);
return;
+
+err_misc:
+ kfree(id);
+err_kmalloc:
+ drive->present = 0;
+ return;
}

/*
@@ -759,11 +768,23 @@
}
minors = units * (1<<PARTN_BITS);
gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
- gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
- gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
- bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
- max_sect = kmalloc (minors*sizeof(int), GFP_KERNEL);
- max_ra = kmalloc (minors*sizeof(int), GFP_KERNEL);
+ if (!gd)
+ goto err_kmalloc_gd;
+ gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
+ if (!gd->sizes)
+ goto err_kmalloc_gd_sizes;
+ gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
+ if (!gd->part)
+ goto err_kmalloc_gd_part;
+ bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
+ if (!bs)
+ goto err_kmalloc_gs;
+ max_sect = kmalloc (minors*sizeof(int), GFP_KERNEL);
+ if (!max_sect)
+ goto err_kmalloc_max_sect;
+ max_ra = kmalloc (minors*sizeof(int), GFP_KERNEL);
+ if (!max_ra)
+ goto err_kmalloc_max_ra;

memset(gd->part, 0, minors * sizeof(struct hd_struct));

@@ -816,6 +837,21 @@
devfs_mk_dir (ide_devfs_handle, name, NULL);
}
}
+ return;
+
+err_kmalloc_max_ra:
+ kfree(max_sect);
+err_kmalloc_max_sect:
+ kfree(bs);
+err_kmalloc_gs:
+ kfree(gd->part);
+err_kmalloc_gd_part:
+ kfree(gd->sizes);
+err_kmalloc_gd_sizes:
+ kfree(gd);
+err_kmalloc_gd:
+ printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
+ return;
}

static int hwif_init (ide_hwif_t *hwif)
--
regards,
Rasmus(rasmus@jaquet.dk)
An Emacs reference mug is what I want. It would hold ten gallons of
coffee. -- Steve VanDevender
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