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Commit 294f2ad5 authored by Abhijith Das's avatar Abhijith Das Committed by Steven Whitehouse
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GFS2: kernel panic with small gfs2 filesystems - 1 RG 



In the unlikely setup where there's only one resource group in the gfs2
filesystem, gfs2_rgrpd_get_next() returns a NULL rgd that is not dealt with
properly, causing a kernel NULL ptr dereference. This patch fixes this issue.

Signed-off-by: default avatarAbhi Das <adas@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 44b8db13

fs/gfs2/rgrp.c

+1 −0
Original line number Diff line number Diff line
@@ -1276,6 +1276,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested) 
			/* fall through */

		case GLR_TRYFAILED:

			rgd = gfs2_rgrpd_get_next(rgd);

			rgd = rgd ? : begin; /* if NULL, wrap */

			if (rgd != begin) /* If we didn't wrap */

				break;